When there are uncertainties I'm slowed down and not able to move forward.
I thought that standard for all translation files would be in UTF-8, but my file format check below makes me confused and uncertain on the facts
:~/svn/reactos/base/setup/usetup/lang$ file sv-SE.h
sv-SE.h: ISO-8859 C program text
:~/svn/reactos/base/setup/usetup/lang$ file en-US.h
en-US.h: ASCII English text
:~/svn/reactos/base/setup/usetup/lang$ file nn-NO.h
nn-NO.h: ASCII text
:~/svn/reactos/base/setup/usetup/lang$ file ru-RU.h
ru-RU.h: Non-ISO extended-ASCII English text, with LF, NEL line terminators
:~/svn/reactos/base/setup/usetup/lang$ file it-IT.h
it-IT.h: Non-ISO extended-ASCII text, with LF, NEL line terminators
:~/svn/reactos/base/setup/usetup/lang$