Internationalisation of javascript/t* directories

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/templates/issuable_template_selector.js

@@ -3,6 +3,7 @@
 import $ from 'jquery';
 import Api from '../api';
 import TemplateSelector from '../blob/template_selector';
+import { __ } from '~/locale';
 
 export default class IssuableTemplateSelector extends TemplateSelector {
   constructor(...args) {
@@ -25,7 +26,7 @@ export default class IssuableTemplateSelector extends TemplateSelector {
     $('.no-template', this.dropdown.parent()).on('click', () => {
       this.currentTemplate.content = '';
       this.setInputValueToTemplateContent();
-      $('.dropdown-toggle-text', this.dropdown).text('Choose a template');
+      $('.dropdown-toggle-text', this.dropdown).text(__('Choose a template'));
     });
   }
 

app/assets/javascripts/terminal/terminal.js

@@ -4,6 +4,7 @@ import { Terminal } from 'xterm';
 import * as fit from 'xterm/lib/addons/fit/fit';
 import * as webLinks from 'xterm/lib/addons/webLinks/webLinks';
 import { canScrollUp, canScrollDown } from '~/lib/utils/dom_utils';
+import { __ } from '~/locale';
 
 const SCROLL_MARGIN = 5;
 
@@ -78,7 +79,8 @@ export default class GLTerminal {
   }
 
   handleSocketFailure() {
-    this.terminal.write('\r\nConnection failure');
+    this.terminal.write('\r\n');
+    this.terminal.write(__('Connection failure'));
   }
 
   addScrollListener(onScrollLimit) {

locale/gitlab.pot

@@ -1740,6 +1740,9 @@ msgstr ""
 msgid "Choose a role permission"
 msgstr ""
 
+msgid "Choose a template"
+msgstr ""
+
 msgid "Choose a template..."
 msgstr ""
 
@@ -2606,6 +2609,9 @@ msgstr ""
 msgid "Connect repositories from GitHub"
 msgstr ""
 
+msgid "Connection failure"
+msgstr ""
+
 msgid "Container Registry"
 msgstr ""