1. remove duplicated helpcontent_01.tgz in DISTFILES
section
2. LC_ALL and LANG are C for building[1]
3. do not pass CPUTYPE, as in some environment build fails
and basically ignores (this port doesn't honor CFLAGS etc)
4. adding memo for localized languages [2]
5. SDK is now buildable
6. change russian translation patch so as to apply much easier
7. helpcontent_31_unix.tgz does not exist, but 30.
PR: 84786 [1] 83502 [2]
Submitted by : achix mantzix[1] and Harald Schmalzbauer[2]