output /langpacks/english/=core=.txt as utf-8 with BOM, so after translate.js all files can be easily combined into langpack file by simple command "copy =core=txt +.\plugins\*.txt langapack_file.txt"

git-svn-id: http://svn.miranda-ng.org/main/trunk@3282 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c