For GT-I8160 - Galaxy Ace 2
Boot into recovery *
Install temporary CWM **
Wipe data/cache/dalvik (optional)
Install Multi-lang Package (optional)
Flash Themes fix
Flash Gapps from recovery
* Vol up + Home + Power
** Skip if you are using custom kernel with CWM built-in
INSTALL GAPPS ONLY AFTER FIRST BOOT!! NO BEFORE!!
If still not working just flash it and wipe cache, factory reset and wipe dalvik cache
MIUI v5 GT-I8160 Beta 3
Beta 3 Multi-lang
Special thanks :
dh.harald for CM 10 base and Kernel sources - Thank him !
fedevd for help and support - Thank him !
asdfzz for fixes - Thank him !
Xiaomi for releases
Lens_flare for his excellent guide