Assegnate 4 su 5 stelle

htamas: this issue is definitely related to StartupMaster: removing this addon fixes the language support again, so that "Inbox" becomes "Posteingang" again, etc.

Re-Installing this addon turns "Posteingang" into "Inbox" again.

This behaviour is repeatable as often as you like.

Questa recensione riguarda una versione precedente (1.5.1-signed.1-signed) del componente aggiuntivo. 

Could you please check whether the problem persists with this development version?
http://htamas.ces.hu/startupmaster/temp/startupmaster-1.6a1.xpi