"Collapse" button in expanded conversations is not translated

I noticed the "Collapse" button shown in expanded conversations wasn't being translated despite the translation being available : src/i18n/messages.js#L850

I submitted !266 (merged) trying to fix this.

Is it the right way to do it ?

edit: Finally got my dev instance of plerome and pleroma-fe working, so I could actually test it!

mentioned in merge request !266 (merged)

closed via merge request !266 (merged)

closed via commit 28c60832

mentioned in commit 28c60832