Internationalisation of ide 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/ide/ide_router.js

@@ -3,6 +3,7 @@ import VueRouter from 'vue-router';
 import { joinPaths } from '~/lib/utils/url_utility';
 import flash from '~/flash';
 import store from './stores';
+import { __ } from '~/locale';
 
 Vue.use(VueRouter);
 
@@ -94,7 +95,7 @@ router.beforeEach((to, from, next) => {
       })
       .catch(e => {
         flash(
-          'Error while loading the project data. Please try again.',
+          __('Error while loading the project data. Please try again.'),
           'alert',
           document,
           null,

app/assets/javascripts/ide/stores/modules/file_templates/getters.js

 import { activityBarViews } from '../../../constants';
+import { __ } from '~/locale';
 
 export const templateTypes = () => [
   {
@@ -10,11 +11,11 @@ export const templateTypes = () => [
     key: 'gitignores',
   },
   {
-    name: 'LICENSE',
+    name: __('LICENSE'),
     key: 'licenses',
   },
   {
-    name: 'Dockerfile',
+    name: __('Dockerfile'),
     key: 'dockerfiles',
   },
 ];

locale/gitlab.pot

@@ -3271,6 +3271,9 @@ msgstr ""
 msgid "Do you want to customize how Google Code email addresses and usernames are imported into GitLab?"
 msgstr ""
 
+msgid "Dockerfile"
+msgstr ""
+
 msgid "Domain"
 msgstr ""
 
@@ -3739,6 +3742,9 @@ msgstr ""
 msgid "Error while loading the merge request. Please try again."
 msgstr ""
 
+msgid "Error while loading the project data. Please try again."
+msgstr ""
+
 msgid "Error while migrating %{upload_id}: %{error_message}"
 msgstr ""
 
@@ -5165,6 +5171,9 @@ msgstr ""
 msgid "LFSStatus|Enabled"
 msgstr ""
 
+msgid "LICENSE"
+msgstr ""
+
 msgid "Label"
 msgstr ""