Solve for incorrect uses of media_buttons_context
|Reported by:||nacin||Owned by:||nacin|
media_buttons_context is a filter designed to change the label 'Upload/Insert', which is now gone. Unfortunately a lot of code used this as a cheap way to insert media buttons, rather than using the media_buttons filter.
We need to remain compatible here, though it won't be easy. (Such is life.) We need some research into the common ways of modifying this string to insert more things.
If you are a developer reading this, please switch to media_buttons. It'll still work in both 3.4 and 3.5.
This came out of #22186.