General: Improve terminology used when referring to installations of WordPress and its extensions.

"Install" is not a noun, and while it might be acceptable to use the verb as a noun, it is not correct. Using the correct
noun, "installation", increases clarity, especially for non-native English speakers.

This change fixes the usage in user-facing text and in developer documentation.

Fixes #41620


git-svn-id: https://develop.svn.wordpress.org/trunk@41289 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/network/settings.php

@@ -10,7 +10,7 @@
 /** Load WordPress Administration Bootstrap */
 require_once( dirname( __FILE__ ) . '/admin.php' );
 
-/** WordPress Translation Install API */
+/** WordPress Translation Installation API */
 require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
 
 if ( ! current_user_can( 'manage_network_options' ) )
@@ -62,7 +62,7 @@ if ( $_POST ) {
 		'first_comment_email',
 	);
 
-	// Handle translation install.
+	// Handle translation installation.
 	if ( ! empty( $_POST['WPLANG'] ) && current_user_can( 'install_languages' ) ) {
 		$language = wp_download_language_pack( $_POST['WPLANG'] );
 		if ( $language ) {