added some missing language checks and adjusted some others

[firewave]

Settings::Standards are always both set so we cannot simply check that but need to combine with an check for the actual language being used.

[firewave]

With this change we should finally actually perform only the language appropriate handling.

There is surely still code we could add such checks to - please try to keep that in mind if you come across such. In some cases we do check for C and C++ patterns in the same match call - those could be split up but in most cases might not have much of an impact aside from being a bit clearer.