Make "Choose Tags" link translatable

closes flarum/core#345

extensions/tags/js/forum/src/addTagComposer.js

@@ -35,7 +35,7 @@ export default function() {
       <a className="DiscussionComposer-changeTags" onclick={this.chooseTags.bind(this)}>
         {this.tags.length
           ? tagsLabel(this.tags)
-          : <span className="TagLabel untagged">Choose Tags</span>}
+          : <span className="TagLabel untagged">{app.trans('tags.tag_new_discussion_link')}</span>}
       </a>
     ), 10);
   });

extensions/tags/locale/en.yml

@@ -6,6 +6,7 @@ tags:
   added_tags: "added the {tags}"
   removed_tags: "removed the {tags}"
   tag_new_discussion_title: Choose Tags for Your Discussion
+  tag_new_discussion_link: Choose Tags
   edit_discussion_tags_title: "Edit Tags for {title}"
   edit_discussion_tags_link: Edit Tags
   choose_primary_tags:

extensions/tags/src/Listeners/AddClientAssets.php

@@ -34,6 +34,7 @@ class AddClientAssets
             'tags.added_tags',
             'tags.removed_tags',
             'tags.tag_new_discussion_title',
+            'tags.tag_new_discussion_link',
             'tags.edit_discussion_tags_title',
             'tags.edit_discussion_tags_link',
             'tags.choose_primary_tags',