private void CopyTranslation (Subtitles subtitles, Subtitles translation) {
for (int subtitleNumber = 0 ; subtitleNumber < translation.Collection.Count ; subtitleNumber++) {
Subtitle translated = translation.Collection[subtitleNumber];
Subtitle original = subtitles.Collection[subtitleNumber];
string translatedText = translated.Text.Get();
original.Translation.Set(translatedText);
}
}