Localized bundles are only showing en-US text
All of our localized bundles are broken with the switch to Firefox 60.1.0 ESR. Once a localized bundle is starting up only en-US text is shown. Looking at the language packs state in about:addons
it shows that it got disabled as it is unsigned. I suspect this is due to https://bugzilla.mozilla.org/show_bug.cgi?id=1454141. So, it seems Mozilla is not providing signed language packs in their candidate builds right now. :(