Remove "po/du". "du" is invalid language code (fixes #881).
Merge remote-tracking branch 'proller/next_tools' into next
Merge remote-tracking branch 'proller/liquid63' into next
Merge remote-tracking branch 'proller/math' into next
Merge remote-tracking branch 'proller/sqlite' into next
Merge remote-tracking branch 'proller/json' into next
Merge remote-tracking branch 'proller/heat' into next
Merge remote-tracking branch 'proller/weather' into next
Merge remote-tracking branch 'sapier/avoid_facedir_if_not_moving' into next
Merge remote-tracking branch 'sapier/modmgr_fixes' into next
Merge remote-tracking branch 'ShadowNinja/bind_address' into next
Merge remote-tracking branch 'proller/clouds' into next
Merge remote-tracking branch 'Zeg9/slippery' into next
Merge remote-tracking branch 'MirceaKitsune/sun_moon_coloring' into next
Merge remote-tracking branch 'PilzAdam/vbo' into next
Merge remote-tracking branch 'sapier/pathfinder_bugfixes' into next
Merge remote-tracking branch 'sweetbomber/spawn' into next
Merge remote-tracking branch 'MirceaKitsune/brighter_sun_faces' into next
Merge remote-tracking branch 'sapier/fix_crash_on_lua_exception' into next
Merge remote-tracking branch 'sapier/lua_show_backtrace_on_error' into next