There were a handfull instances of the kind
1) gettextFromC::instance()->tr(...)
2) gettextFromC::instance()->trGettext(...)
1) is pointless, as tr is a static function.
All instances of 2) were likewise pointless, because trGettext()
returns a C-string, which was then immediately converted to a
QString.
Thus, replace both constructs by gettextFromC::tr(...).
After this change there was only one user of gettextFromC::instance()
left, viz. the C-interface funtion trGettext(). Therefore, remove
gettextFromC::instance() and do all the caching / translating
directly in the global trGettext().
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
879cb73b8b