How is it impossible to import the contents of a single file as a single string into Transifex? Transifex should not have to care about how the game actually uses this file, so there should be no problem with treating it as single string.
Translating this line-by-line is just completely stupid and it doesn’t even work. To translate this, you would actually have to use an external text editor,
translate the full string there, and than pasting each line into Transifex. The reason for this is because you can’t translate the lines in isolation, mostly because of line breaks you have to use for verbose languages.
BUT: The English original credits file currently has 15 lines, but the comments say you can use up to 21 lines. But because you only imported it line-wise, you are still restricted to 15 lines. And NO, please don’t now add 6 empty strings to Transifex, this is just stupid.
So just import the contents of MOTD and credits as a single string each, this would be the most straightforward method.
If you are still unable to fix this, better remove this crap from Transifex, it would only irritate translators. A plain old pull request would be more efficient than using Transifex.
If you don’t want 0.8 to be translated, then why is it on Transifex then?