I bought a paid #Anki deck today, and successfully modified its templates to do things like:
1. set appropriate `lang` attributes for the non-English text, so that a screen reader will switch pronunciation rules automatically;
2. add headings to the different sections of the answer side;
3. group certain related things on the card into lists; and
4. auto-focus the answer when it's shown.
These modifications are synced via my AnkiWeb account, so apply equally whether I'm using a browser or the iOS app. So far, I'm really happy with it as a learning tool, although I have a lot to discover now I'm not thinking about the accessibility of the cards themselves.
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