I have updated the Warped Maps to IFrames[1] tool. Here are the two changes:

 - the background tiles will now default to Wikimedia Maps
 - OSM tiles are no longer available.
 - the "wmf" parameter is no longer in use
 - you can change the language of the WMF tiles with a new "lang" parameter

These changes might result in you having a new background map.
These changes also enables gadgets, tools etc such as Commons Warper Viewer[2] to use localized background maps.

[1]: https://github.com/wikimaps-dev/warped-to-iframe
[2]: https://github.com/Abbe98/commons-warper-viewer.js

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Abbe98