Ask HN: What tool(s) are you using for managing localizations?

We are maintaining projects across a variety of platforms and frameworks - ranging from native iOS/Android, Flutter, Node, React to PHP/Symfony e.g. - and need a tool to ease managing localizations across all of them.

Spreadsheets is coming up short and all existing tools seem to be targeted towards a specific platform/framework (and be super expensive).

Maybe we are missing something?