Make scoped label help text translatable

ee/app/views/shared/labels/_create_label_help_text.html.haml

 - if @label.subject.feature_available?(:scoped_labels)
-  - docs_link = help_page_path('user/project/labels.md', anchor: 'scoped-labels')
+  - docs_url = help_page_path('user/project/labels.md', anchor: 'scoped-labels')
+  - docs_link_start = "<a href='#{docs_url}' target='_blank' rel='noreferrer noopener'>".html_safe
+  - docs_link_end = '</a>'.html_safe
+  - docs_link_placeholders = { link_start: docs_link_start,
+    link_end: docs_link_end,
+    code_start: "<code>".html_safe,
+    code_end: "</code>".html_safe }
 
-  .col-sm-10.offset-sm-2.form-text.text-muted.js-has-scoped-labels.hidden
-    Using
-    %code ::
-    denotes a
-    %a{ href: docs_link, target: '_blank', rel: 'noopener noreferrer' } scoped label set
-  .col-sm-10.offset-sm-2.form-text.text-muted.js-use-scoped-labels
-    Use
-    %code ::
-    to create a
-    %a{ href: docs_link, target: '_blank', rel: 'noopener noreferrer' } scoped label set
-    (eg.
-    %code priority::1
-    )
+  .col-sm-10.offset-sm-2.form-text.text-muted
+    .js-has-scoped-labels.hidden
+      = _('Using %{code_start}::%{code_end} denotes a %{link_start}scoped label set%{link_end}').html_safe % docs_link_placeholders
+    .js-use-scoped-labels
+      = _('Use %{code_start}::%{code_end} to create a %{link_start}scoped label set%{link_end} (eg. %{code_start}priority::1%{code_end})').html_safe % docs_link_placeholders

locale/gitlab.pot

@@ -12103,6 +12103,9 @@ msgstr ""
 msgid "Usage statistics"
 msgstr ""
 
+msgid "Use %{code_start}::%{code_end} to create a %{link_start}scoped label set%{link_end} (eg. %{code_start}priority::1%{code_end})"
+msgstr ""
+
 msgid "Use <code>%{native_redirect_uri}</code> for local tests"
 msgstr ""
 
@@ -12271,6 +12274,9 @@ msgstr ""
 msgid "Users with a Guest role or those who don't belong to any projects or groups don't count towards seats in use."
 msgstr ""
 
+msgid "Using %{code_start}::%{code_end} denotes a %{link_start}scoped label set%{link_end}"
+msgstr ""
+
 msgid "Validate"
 msgstr ""