Fix English names of languages and add Ossetic.
Merge pull request #3320 from ace20022/fix_en_langnames

Fix English names of languages and add Ossetic.
Merge pull request #3321 from Karlson2k/charsetconverter_fix_01

CharsetConverter: fix for logicalToVisualBiDi
CharsetConverter: add internal class CInnerConverter and move local static function to it
CharsetConverter: 'static' for all functions
CharsetConverter: define and implement class ConverterType
CharsetConverter: rewrote, use individual locks for each conversion type