Assess basic text input in each target language on at least one common Android IME.
Without knowing the language in question, enter a small amount of text in a variety of contexts, to identify issues with viewport scrolling, selections, keyboard show/hide, and candidate text being lost / duplicated / prematurely committed.
Obviously, this does not replace the need for acceptance testing by editors who understand each individual language.
Steps to perform: https://www.mediawiki.org/wiki/VisualEditor_mobile_IME_analysis
Target wikis: https://www.mediawiki.org/wiki/Visual-based_mobile_editing/Mobile_editing_documentation#Target_wikis
Acceptance criterion: for each target wiki, the above steps have been performed, and each arising issue has been recorded and analysed in detail (i.e. the enough to understand the underlying cause, expressed as an interplay between the mobile IME, the browser DOM, VE ContentEditable classes and the VE data model).