Fix typo in lua_api.txt
Fixes #1687 by extra semaphore retval handle code for OSX

See https://github.com/minetest/minetest/issues/1687#issuecomment-56830173

Signed-off-by: Craig Robbins <kde.psych@gmail.com>
Update Spanish language.

Signed-off-by: Craig Robbins <kde.psych@gmail.com>
Update French translation

Signed-off-by: Craig Robbins <kde.psych@gmail.com>