Support for open type's Localized forms [locl] feature

[igarbev]

Please add support for OpenType locl feature - Localized forms. 

 

Currently you can switch the language of a text from the Character palette, but this doesn't trigger the locl feature. (This is how it usually works in Adobe apps)

This feature is quite important especially for Cyrillic scripts. 

 

Tested this with Affinity Designer, not sure what is the case with Affinity Photo.