Hi,
It's mostly Kenyan (ALS, etc.), or South African (Air-Tec, Solenta, etc.) companies. As far as i know ALL of them require experience on type (B190, L410, DHC8, etc.) and MOST of them also require the relevant license (SA, or Kenyan CPL/ATPL) and in SOME cases, especially flying in and out of their countries of origin, the right to live and work permits. But this latter is rarely the case. Basically if you're typed and experienced, holding the right license you can get a job with them.
Knowing local languages bares little or no relevance if you're flying however for any ground based position it definitely helps.
Cheers