po: Update translations
- po/cs.po 3 additions, 7 deletionspo/cs.po
- po/de.po 4 additions, 5 deletionspo/de.po
- po/nl.po 6 additions, 7 deletionspo/nl.po
- po/pl.po 4 additions, 8 deletionspo/pl.po
- po/ru.po 5 additions, 6 deletionspo/ru.po
- po/vi.po 30 additions, 31 deletionspo/vi.po
- po/zh_CN.po 5 additions, 6 deletionspo/zh_CN.po