Internationalisation of behaviors directory

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

app/assets/javascripts/behaviors/copy_to_clipboard.js

 import $ from 'jquery';
 import Clipboard from 'clipboard';
+import { sprintf, __ } from '~/locale';
 
 function showTooltip(target, title) {
   const $target = $(target);
@@ -16,7 +17,7 @@ function showTooltip(target, title) {
 }
 
 function genericSuccess(e) {
-  showTooltip(e.trigger, 'Copied');
+  showTooltip(e.trigger, __('Copied'));
   // Clear the selection and blur the trigger so it loses its border
   e.clearSelection();
   $(e.trigger).blur();
@@ -33,7 +34,7 @@ function genericError(e) {
   } else {
     key = 'Ctrl';
   }
-  showTooltip(e.trigger, `Press ${key}-C to copy`);
+  showTooltip(e.trigger, sprintf(__(`Press %{key}-C to copy`), { key }));
 }
 
 export default function initCopyToClipboard() {

app/assets/javascripts/behaviors/markdown/nodes/table_of_contents.js

 /* eslint-disable class-methods-use-this */
 
 import { Node } from 'tiptap';
+import { __ } from '~/locale';
 
 // Transforms generated HTML back to GFM for Banzai::Filter::TableOfContentsFilter
 export default class TableOfContents extends Node {
@@ -22,7 +23,7 @@ export default class TableOfContents extends Node {
           priority: 51,
         },
       ],
-      toDOM: () => ['p', { class: 'table-of-contents' }, 'Table of Contents'],
+      toDOM: () => ['p', { class: 'table-of-contents' }, __('Table of Contents')],
     };
   }
 

app/assets/javascripts/behaviors/preview_markdown.js

@@ -22,7 +22,7 @@ function MarkdownPreview() {}
 
 // Minimum number of users referenced before triggering a warning
 MarkdownPreview.prototype.referenceThreshold = 10;
-MarkdownPreview.prototype.emptyMessage = 'Nothing to preview.';
+MarkdownPreview.prototype.emptyMessage = __('Nothing to preview.');
 
 MarkdownPreview.prototype.ajaxCache = {};
 
@@ -40,7 +40,7 @@ MarkdownPreview.prototype.showPreview = function($form) {
     preview.text(this.emptyMessage);
     this.hideReferencedUsers($form);
   } else {
-    preview.addClass('md-preview-loading').text('Loading...');
+    preview.addClass('md-preview-loading').text(__('Loading...'));
     this.fetchMarkdownPreview(
       mdText,
       url,

app/assets/javascripts/behaviors/quick_submit.js

 import $ from 'jquery';
 import '../commons/bootstrap';
 import { isInIssuePage } from '../lib/utils/common_utils';
+import { __ } from '~/locale';
 
 // Quick Submit behavior
 //
@@ -65,7 +66,9 @@ $(document).on(
     }
 
     const $this = $(this);
-    const title = isMac() ? 'You can also press ⌘-Enter' : 'You can also press Ctrl-Enter';
+    const title = isMac()
+      ? __('You can also press ⌘-Enter')
+      : __('You can also press Ctrl-Enter');
 
     $this.tooltip({
       container: 'body',

locale/gitlab.pot

@@ -2690,6 +2690,9 @@ msgstr ""
 msgid "ConvDev Index"
 msgstr ""
 
+msgid "Copied"
+msgstr ""
+
 msgid "Copy %{http_label} clone URL"
 msgstr ""
 
@@ -6173,6 +6176,9 @@ msgstr ""
 msgid "Notes|Show history only"
 msgstr ""
 
+msgid "Nothing to preview."
+msgstr ""
+
 msgid "Notification events"
 msgstr ""
 
@@ -6751,6 +6757,9 @@ msgstr ""
 msgid "Preferences|This feature is experimental and translations are not complete yet"
 msgstr ""
 
+msgid "Press %{key}-C to copy"
+msgstr ""
+
 msgid "Press Enter or click to search"
 msgstr ""
 
@@ -8869,6 +8878,9 @@ msgstr ""
 msgid "System metrics (Kubernetes)"
 msgstr ""
 
+msgid "Table of Contents"
+msgstr ""
+
 msgid "Tag"
 msgstr ""
 
@@ -10659,6 +10671,12 @@ msgstr ""
 msgid "You can also create a project from the command line."
 msgstr ""
 
+msgid "You can also press ⌘-Enter"
+msgstr ""
+
+msgid "You can also press Ctrl-Enter"
+msgstr ""
+
 msgid "You can also star a label to make it a priority label."
 msgstr ""