command for translation check
copy paste into console
/c game.check_prototype_translations()

 118.055 Info LuaGameScript.cpp:3032: entity "natural-gas-mk02" (pypetroleumhandling) has no translation.
 118.055 Info LuaGameScript.cpp:3032: entity "natural-gas-mk03" (pypetroleumhandling) has no translation.
 118.055 Info LuaGameScript.cpp:3032: entity "natural-gas-mk04" (pypetroleumhandling) has no translation.