In the section [LanguageStrings] of the file PhotoFiltrePortable.ini all those entries have been omitted, in which left and right of the equal sign occurs the same value (eg de=de). For such a language this however means, that the chosen language of the PA.c menu doesn't appears in the program. Instead the program starts in the english language.
Here is the correct section [LanguageStrings]:
[LanguageStrings] pt-br=br be=by zh-cn=cn zh-tw=tw cs=cz da=da de=de es=es et=et fi=fi hu=hu it=it ja=jp uk=kr nl=nl no=no pl=pl pt=pt ru=ru sl=si sk=sk sv=sv ar-sa=tn tr=tr vi=vi