[Pcbsd-translations] InstallLang_en.ts, NetworkManager_en.ts, PBC_en.ts are translated in Bengali

[Khandakar M. I. S. <suz...@gm...>]

Hi Charles,
InstallLang_en.ts, NetworkManager_en.ts, PBC_en.ts are translated in 
Bengali and attached.
Please update the translator list for Bengali.

Khoda hafez,
Suzan