Merry Christmas, Frank.
The easiest way to solve this is to use an If statement or switch statement based on the culture code:
if (cultureCode == "fr-FR"){ //TODO: french translation automaticUpdater.Translation.Checking = "..."; ...}else if (cultureCode == "de-DE"){ //TODO: german translation automaticUpdater.Translation.Checking = "..."; ...}
etc...
This should all be executed in the constructor of your form. Of course, you can simplify it further to load strings from a file.
Tell me if this helps.