Specify documentation except for listed languages.

[albert-github]

With the commands \~ and \~LanguageId it is possible to specify comments for one or all languages. When one wants to write the documentation for the languages except for some specified this needs a complete set of commands, with this enhancement this can be done with one command.

Example: example.tar.gz

Adjusted example (due to bc508bd) : example1.tar.gz

[doxygen]

I have some concerns.

1. Is there a use-case for this? I can only think about using it as fallback telling some translation is missing.
2. I think the \~lang and \~{lang} look a bit too similar, and it is not intuitively clear one is the negation of the other, maybe \~!{lang} would be more clear.
3. From a usability point of view, I would prefer something like \~dutch Nederlands \~german Deutsch \~else Fallback to e.g. english text \~.

[albert-github]

1. No there is not a direct use case, but it is a bit strange that one cannot easily signal the fallback telling some translation is missing.
2. They are indeed quite similar, \~!{lang} would indeed be more clear.
3. I thought about this as well but decided against it as
   • one has to keep track of which language have already been selected and reset the list when \~ is given / end of a comment block
   • the current solution gives also a possibility to have \~dutch Nederlands \~german Deutsch \~{dutch} some "Fallback" even for a previous handled language (probably quite unusual / uncommon but gives more flexibility) \~.

I think best is to implement the solution mentioned under 2.