Add better support for multiple locales in translations

[Khartir]

When trying to follow a translation key to the file that supports it, the dropdown to select the files containing that key show all files that match, but show the same <>source entry for all files:

It would be helpful if either the filename or the locale would be shown.

[zelding]

I came to ask for the same, unfortunately there was no visible progress made on this in years.
With Symfony 3 + xlf files, I have the same popup, even though all the files have the source-language and target-language attributes set on the file node

[Haehnchen]

The main problem is that is basically already supported, but as "xlf" are non offical formats it depends now on plugins an other stuff ;)

I now why you see this kind of items, i will check if there is a suitable ways to rebuild the item rendering inside the plugin itself.

[Haehnchen]

included with much more :)

• icons
• symfony layer icon
• upvoting
• improved text ;)
• ...