diff --git a/public/i18n/bg/api-errors.json b/public/i18n/bg/api-errors.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/public/i18n/bg/api-errors.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/public/i18n/ca/api-errors.json b/public/i18n/ca/api-errors.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/public/i18n/ca/api-errors.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/public/i18n/de/api-errors.json b/public/i18n/de/api-errors.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/public/i18n/de/api-errors.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/public/i18n/en/api-errors.json b/public/i18n/en/api-errors.json
new file mode 100644
index 0000000..1466eba
--- /dev/null
+++ b/public/i18n/en/api-errors.json
@@ -0,0 +1,22 @@
+{
+    "unknown": "Unknown error",
+    "gravity_error": "Failed to create the blocklist",
+    "ftl_connection_fail": "Failed to connect to FTL",
+    "ftl_read_error": "Error reading from FTL",
+    "ftl_eom_error": "Read unexpected EOM from FTL",
+    "not_found": "Not found",
+    "already_exists": "Item already exists",
+    "invalid_domain": "Invalid domain",
+    "bad_request": "Bad request",
+    "unauthorized": "Unauthorized",
+    "file_read": "Error reading from {{file}}",
+    "file_write": "Error writing to {{file}}",
+    "config_parsing_error": "Error parsing the config",
+    "invalid_setting_value": "Invalid setting value",
+    "restart_dns_error": "Failed to restart the DNS server",
+    "dnsmasq_config_write": "Error generating the dnsmasq config",
+    "shared_memory_open": "Failed to open shared memory",
+    "shared_memory_read": "Failed to read from shared memory",
+    "shared_memory_lock": "Failed to lock shared memory",
+    "API Error: {{error}}": "API Error: {{error}}"
+}
\ No newline at end of file
diff --git a/public/i18n/en/settings.json b/public/i18n/en/settings.json
index 66c6b1e..60197be 100644
--- a/public/i18n/en/settings.json
+++ b/public/i18n/en/settings.json
@@ -22,5 +22,8 @@
     "Branch": "Branch",
     "Hash": "Hash",
     "Tag": "Tag",
-    "Only forward public reverse lookups": "Only forward public reverse lookups"
+    "Only forward public reverse lookups": "Only forward public reverse lookups",
+    "Processing...": "Processing...",
+    "Successfully saved settings": "Successfully saved settings",
+    "Apply": "Apply"
 }
\ No newline at end of file
diff --git a/public/i18n/es/api-errors.json b/public/i18n/es/api-errors.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/public/i18n/es/api-errors.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/public/i18n/fr/api-errors.json b/public/i18n/fr/api-errors.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/public/i18n/fr/api-errors.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/public/i18n/pt/api-errors.json b/public/i18n/pt/api-errors.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/public/i18n/pt/api-errors.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/src/components/common/Alert.js b/src/components/common/Alert.js
index c39ae93..8669ee3 100644
--- a/src/components/common/Alert.js
+++ b/src/components/common/Alert.js
@@ -27,7 +27,11 @@ const Alert = props => {
 Alert.propTypes = {
   message: PropTypes.node.isRequired,
   type: PropTypes.string.isRequired,
-  onClick: PropTypes.func.isRequired
+  onClick: PropTypes.func
+};
+
+Alert.defaultProps = {
+  onClick: () => {}
 };
 
 export default Alert;
diff --git a/src/components/settings/DHCPInfo.js b/src/components/settings/DHCPInfo.js
index 9867a41..5cb3166 100644
--- a/src/components/settings/DHCPInfo.js
+++ b/src/components/settings/DHCPInfo.js
@@ -23,45 +23,46 @@ import {
   Label
 } from "reactstrap";
 import { isPositiveNumber, isValidHostname, isValidIpv4 } from "../../validate";
+import Alert from "../common/Alert";
 
 class DHCPInfo extends Component {
   state = {
-    active: false,
-    ip_start: "",
-    ip_end: "",
-    router_ip: "",
-    lease_time: "",
-    domain: "",
-    ipv6_support: false
+    alertMessage: "",
+    alertType: "",
+    showAlert: false,
+    processing: false,
+    settings: {
+      active: false,
+      ip_start: "",
+      ip_end: "",
+      router_ip: "",
+      lease_time: "",
+      domain: "",
+      ipv6_support: false
+    }
   };
 
-  constructor(props) {
-    super(props);
-    this.updateDHCPInfo = this.updateDHCPInfo.bind(this);
-  }
-
-  updateDHCPInfo() {
-    this.updateHandler = makeCancelable(api.getDHCPInfo(), {
-      repeat: this.updateDHCPInfo,
-      interval: 600000
-    });
+  loadDHCPInfo = () => {
+    this.updateHandler = makeCancelable(api.getDHCPInfo());
     this.updateHandler.promise
       .then(res => {
         this.setState({
-          active: res.active,
-          ip_start: res.ip_start,
-          ip_end: res.ip_end,
-          router_ip: res.router_ip,
-          lease_time: res.lease_time,
-          domain: res.domain,
-          ipv6_support: res.ipv6_support
+          settings: {
+            active: res.active,
+            ip_start: res.ip_start,
+            ip_end: res.ip_end,
+            router_ip: res.router_ip,
+            lease_time: res.lease_time,
+            domain: res.domain,
+            ipv6_support: res.ipv6_support
+          }
         });
       })
       .catch(ignoreCancel);
-  }
+  };
 
   componentDidMount() {
-    this.updateDHCPInfo();
+    this.loadDHCPInfo();
   }
 
   componentWillUnmount() {
@@ -77,10 +78,16 @@ class DHCPInfo extends Component {
    * @returns {function(Event)}
    */
   onChange = (key, attr) => {
-    return e =>
-      this.setState({
-        [key]: e.target[attr]
-      });
+    return e => {
+      const value = e.target[attr];
+
+      this.setState(oldState => ({
+        settings: {
+          ...oldState.settings,
+          [key]: value
+        }
+      }));
+    };
   };
 
   /**
@@ -91,7 +98,44 @@ class DHCPInfo extends Component {
   saveSettings = e => {
     e.preventDefault();
 
-    // TODO: send settings to API
+    const { t } = this.props;
+
+    this.setState({
+      alertMessage: t("Processing..."),
+      alertType: "info",
+      showAlert: true,
+      processing: true
+    });
+
+    api
+      .updateDHCPInfo(this.state.settings)
+      .then(() => {
+        this.setState({
+          alertMessage: t("Successfully saved settings"),
+          alertType: "success",
+          showAlert: true,
+          processing: false
+        });
+      })
+      .catch(error => {
+        let message = "";
+
+        if (error instanceof Error) {
+          message = error.message;
+        } else {
+          // Translate the API's error message
+          message = t("API Error: {{error}}", {
+            error: t(error.key, error.data)
+          });
+        }
+
+        this.setState({
+          alertMessage: message,
+          alertType: "danger",
+          showAlert: true,
+          processing: false
+        });
+      });
   };
 
   /**
@@ -101,37 +145,55 @@ class DHCPInfo extends Component {
    * @param validator the validation function
    */
   isSettingValid = (value, validator) => {
-    return (!this.state.active && value.length === 0) || validator(value);
+    return (
+      (!this.state.settings.active && value.length === 0) || validator(value)
+    );
+  };
+
+  hideAlert = () => {
+    this.setState({ showAlert: false });
   };
 
   render() {
     const { t } = this.props;
 
     const isIpStartValid = this.isSettingValid(
-      this.state.ip_start,
+      this.state.settings.ip_start,
+      isValidIpv4
+    );
+    const isIpEndValid = this.isSettingValid(
+      this.state.settings.ip_end,
       isValidIpv4
     );
-    const isIpEndValid = this.isSettingValid(this.state.ip_end, isValidIpv4);
     const isRouterIpValid = this.isSettingValid(
-      this.state.router_ip,
+      this.state.settings.router_ip,
       isValidIpv4
     );
     const isLeaseTimeValid = this.isSettingValid(
-      this.state.lease_time,
+      this.state.settings.lease_time,
       isPositiveNumber
     );
     const isDomainValid = this.isSettingValid(
-      this.state.domain,
+      this.state.settings.domain,
       isValidHostname
     );
 
+    const alert = this.state.showAlert ? (
+      <Alert
+        message={this.state.alertMessage}
+        type={this.state.alertType}
+        onClick={this.hideAlert}
+      />
+    ) : null;
+
     return (
       <Form onSubmit={this.saveSettings}>
+        {alert}
         <FormGroup check>
           <Label check>
             <Input
               type="checkbox"
-              checked={this.state.active}
+              checked={this.state.settings.active}
               onChange={this.onChange("active", "checked")}
             />
             {t("Enabled")}
@@ -144,8 +206,8 @@ class DHCPInfo extends Component {
           <Col sm={10}>
             <Input
               id="startIP"
-              disabled={!this.state.active}
-              value={this.state.ip_start}
+              disabled={!this.state.settings.active}
+              value={this.state.settings.ip_start}
               onChange={this.onChange("ip_start", "value")}
               invalid={!isIpStartValid}
             />
@@ -158,8 +220,8 @@ class DHCPInfo extends Component {
           <Col sm={10}>
             <Input
               id="endIP"
-              disabled={!this.state.active}
-              value={this.state.ip_end}
+              disabled={!this.state.settings.active}
+              value={this.state.settings.ip_end}
               onChange={this.onChange("ip_end", "value")}
               invalid={!isIpEndValid}
             />
@@ -172,8 +234,8 @@ class DHCPInfo extends Component {
           <Col sm={10}>
             <Input
               id="routerIP"
-              disabled={!this.state.active}
-              value={this.state.router_ip}
+              disabled={!this.state.settings.active}
+              value={this.state.settings.router_ip}
               onChange={this.onChange("router_ip", "value")}
               invalid={!isRouterIpValid}
             />
@@ -187,12 +249,12 @@ class DHCPInfo extends Component {
             <InputGroup>
               <Input
                 id="leaseTime"
-                disabled={!this.state.active}
-                value={this.state.lease_time}
+                disabled={!this.state.settings.active}
+                value={this.state.settings.lease_time}
                 onChange={this.onChange("lease_time", "value")}
                 invalid={!isLeaseTimeValid}
               />
-              <InputGroupAddon addonType={"append"}>Hours</InputGroupAddon>
+              <InputGroupAddon addonType="append">Hours</InputGroupAddon>
             </InputGroup>
           </Col>
         </FormGroup>
@@ -203,8 +265,8 @@ class DHCPInfo extends Component {
           <Col sm={10}>
             <Input
               id="domain"
-              disabled={!this.state.active}
-              value={this.state.domain}
+              disabled={!this.state.settings.active}
+              value={this.state.settings.domain}
               onChange={this.onChange("domain", "value")}
               invalid={!isDomainValid}
             />
@@ -214,8 +276,8 @@ class DHCPInfo extends Component {
           <Label check>
             <Input
               type="checkbox"
-              disabled={!this.state.active}
-              checked={this.state.ipv6_support}
+              disabled={!this.state.settings.active}
+              checked={this.state.settings.ipv6_support}
               onChange={this.onChange("ipv6_support", "checked")}
             />
             {t("IPv6 Support")}
@@ -224,6 +286,7 @@ class DHCPInfo extends Component {
         <Button
           type="submit"
           disabled={
+            this.state.processing ||
             !isIpStartValid ||
             !isIpEndValid ||
             !isRouterIpValid ||
@@ -238,4 +301,4 @@ class DHCPInfo extends Component {
   }
 }
 
-export default translate(["common", "settings"])(DHCPInfo);
+export default translate(["common", "settings", "api-errors"])(DHCPInfo);
diff --git a/src/components/settings/DHCPInfo.test.js b/src/components/settings/DHCPInfo.test.js
new file mode 100644
index 0000000..4a4b23d
--- /dev/null
+++ b/src/components/settings/DHCPInfo.test.js
@@ -0,0 +1,135 @@
+/* Pi-hole: A black hole for Internet advertisements
+*  (c) 2017 Pi-hole, LLC (https://pi-hole.net)
+*  Network-wide ad blocking via your own hardware.
+*
+*  Web Interface
+*  DHCPInfo component test
+*
+*  This file is copyright under the latest version of the EUPL.
+*  Please see LICENSE file for your rights under this license. */
+
+import React from "react";
+import { shallow } from "enzyme";
+import DHCPInfo from "./DHCPInfo";
+import fetchMock from "fetch-mock";
+
+const endpoint = "/admin/api/settings/dhcp";
+const fakeData = {
+  active: true,
+  ip_start: "192.168.1.50",
+  ip_end: "192.168.1.150",
+  router_ip: "192.168.1.1",
+  lease_time: "24",
+  domain: "lan",
+  ipv6_support: false
+};
+
+it("retrieves settings correctly", async () => {
+  fetchMock.mock(endpoint, { body: fakeData });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  await tick();
+
+  expect(wrapper.state("settings")).toEqual(fakeData);
+});
+
+it("disables the apply button if an input is invalid", async () => {
+  fetchMock.mock(endpoint, { body: fakeData });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  await tick();
+
+  expect(wrapper.find("Button")).not.toBeDisabled();
+
+  wrapper.find("#domain").simulate("change", { target: { value: "" } });
+
+  expect(wrapper.find("Button")).toBeDisabled();
+});
+
+it("disables inputs only when DHCP is not enabled", async () => {
+  fetchMock.mock(endpoint, { body: fakeData });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  await tick();
+  wrapper.update();
+
+  expect(wrapper.find("#domain")).not.toBeDisabled();
+
+  wrapper.setState({
+    settings: { ...wrapper.state().settings, active: false }
+  });
+
+  expect(wrapper.find("#domain")).toBeDisabled();
+});
+
+it("disables the apply button when processing setting update", async () => {
+  fetchMock.get(endpoint, { body: fakeData });
+  fetchMock.put(endpoint, { body: { status: "success" } });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  await tick();
+
+  expect(wrapper.state().processing).toBeFalsy();
+  expect(wrapper.find("Button")).not.toBeDisabled();
+
+  wrapper.find("Form").simulate("submit", { preventDefault: jest.fn() });
+
+  expect(wrapper.state().processing).toBeTruthy();
+  expect(wrapper.find("Button")).toBeDisabled();
+});
+
+it("sends the correct data to the API when apply is clicked", async () => {
+  fetchMock.get(endpoint, { body: fakeData });
+  fetchMock.put(endpoint, { body: { status: "success" } });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  await tick();
+
+  expect(wrapper.state().processing).toBeFalsy();
+  expect(wrapper.find("Button")).not.toBeDisabled();
+
+  wrapper.find("Form").simulate("submit", { preventDefault: jest.fn() });
+
+  expect(wrapper.state().processing).toBeTruthy();
+  expect(wrapper.find("Button")).toBeDisabled();
+
+  // The output of lastCall is [url, request]
+  const updateRequest = fetchMock.lastCall(endpoint)[1];
+
+  expect(JSON.parse(updateRequest.body)).toEqual(fakeData);
+});
+
+it("shows a success message after successfully saving settings", async () => {
+  fetchMock.get(endpoint, { body: fakeData });
+  fetchMock.put(endpoint, { body: { status: "success" } });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  wrapper.find("Form").simulate("submit", { preventDefault: jest.fn() });
+
+  await tick();
+  wrapper.update();
+
+  expect(wrapper.find("Alert")).toHaveProp("type", "success");
+});
+
+it("shows an API error message if an API error occurs when saving settings", async () => {
+  fetchMock.get(endpoint, { body: fakeData });
+  fetchMock.put(endpoint, {
+    body: { error: { key: "unknown", message: "Unknown", data: null } }
+  });
+
+  const wrapper = shallow(<DHCPInfo />);
+
+  wrapper.find("Form").simulate("submit", { preventDefault: jest.fn() });
+
+  await tick();
+  wrapper.update();
+
+  expect(wrapper.find("Alert")).toHaveProp("type", "danger");
+});
diff --git a/src/i18n.js b/src/i18n.js
index 26b4e54..5fe9281 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -20,7 +20,8 @@ export function setupI18n() {
         "location",
         "login",
         "query-log",
-        "settings"
+        "settings",
+        "api-errors"
       ],
       nsSeparator: false,
       keySeparator: false,
diff --git a/src/util/api.js b/src/util/api.js
index ec3358b..60b4251 100644
--- a/src/util/api.js
+++ b/src/util/api.js
@@ -81,5 +81,8 @@ export default {
   },
   getDHCPInfo() {
     return http.get("settings/dhcp");
+  },
+  updateDHCPInfo(settings) {
+    return http.put("settings/dhcp", settings);
   }
 };
diff --git a/update-translations.js b/update-translations.js
index 74f1362..cf438ed 100644
--- a/update-translations.js
+++ b/update-translations.js
@@ -54,7 +54,7 @@ function getTranslatedLanguages() {
     .then(response => response.json())
     .then(data => {
       return data.result.languages
-        .filter(lang => lang.percentage >= 90)
+        .filter(lang => lang.percentage >= 70)
         .map(lang => lang.code)
     })
 }
@@ -143,7 +143,8 @@ function fetchAllTags(lang) {
     "lists",
     "login",
     "footer",
-    "settings"
+    "settings",
+    "api-errors"
   ];
 
   const bar = multi.newBar(`${lang}\t:percent\t[:bar]`, {
@@ -166,7 +167,7 @@ fs.emptyDirSync(I18N_FOLDER);
 console.log("Fetching languages");
 getTranslatedLanguages()
   .then(languages => {
-    console.log(`Languages over 90% translated: ${languages.join(", ")}`);
+    console.log(`Languages over 70% translated: ${languages.join(", ")}`);
 
     for(const lang of languages)
       fetchAllTags(lang);