let's revise the language in LC_MESSAGES  -> RDMO 3(?)

### Description / Beschreibung

when revising the German translations due to the reoccurring mistake of "tabs" being translated to "Registrierkarte", I found that many sentences in English also needed revising. At times, the English strings and their German translations don't match. 


### Proposal / Vorschlag
Therefore, let's sit down and carefully check EN in the LC_MESSAGES files. 



