Hello, some time ago I've finalized Dash wallet translation into Slovak. It should be quite easy to re-use it for Czech version as well. Transifex also supports such scenario, so you can change source language from English to Slovak (no super English knowledge needed here).
I don't know the languages (except English) but if it's possible it may be easier to export ENG-Slovak and import it as ENG-Czech and then change the strings.
