Please file individual bugs and have them block this one.
The breakage here is that they started to require fully-specified format strings with an explicit '%s' for extlinks captions. See https://github.com/emcconville/wand/commit/460f605f45d406b6d0e2f3e6af7bfa2c62c66882 for an example. They're all pretty much identical to this in terms of fixes. Just shove a %s in the right place.