Allow message strings to be translated

app/controllers/projects/environments/prometheus_api_controller.rb

@@ -14,8 +14,8 @@ class Projects::Environments::PrometheusApiController < Projects::ApplicationCon
 
     if result.nil?
       return render status: :accepted, json: {
-        status: 'processing',
-        message: 'Not ready yet. Try again later.'
+        status: _('processing'),
+        message: _('Not ready yet. Try again later.')
       }
     end
 

locale/gitlab.pot

@@ -8535,6 +8535,9 @@ msgstr ""
 msgid "Protected Environments"
 msgstr ""
 
+msgid "Not ready yet. Try again later."
+msgstr ""
+
 msgid "ProtectedEnvironment|%{environment_name} will be writable for developers. Are you sure?"
 msgstr ""
 
@@ -13237,6 +13240,9 @@ msgstr ""
 msgid "private key does not match certificate."
 msgstr ""
 
+msgid "processing"
+msgstr ""
+
 msgid "project"
 msgid_plural "projects"
 msgstr[0] ""