Describe the improvement

Some strings currently use concatenations. Example:

To Reproduce

Could probably use something like grep -Po 'tr\s*\(.*\).*\+.*' src/* to find other places (this will still yield false positives such as HTML concatenation, which should be OK I think).

Expected behavior

This was suggested by @pljones in #1097 (comment):

Would it not be easier for a translator to have the full text with substitutions (so, QString ( tr ( "Hello, %1" ) ).arg( getName() )..., giving the context)? Here there are three pieces, one starting with a measurement unit.

Additional context
Must only be changed after 3.7.0 is completed.