Family Lists / Indi Lists: records for Given Name starting with Umlaut not shown

[arbor95]

          **but there is still a little bug:**

The Indis of given names, beginning with Umlauts, do not show under the corresponding letter. (Test by Select A or B or ALL given names)

you can see the test at dfrese .

good/ok Ä no longer in selection, but clicking A: result: no indis shown (HOver says 2), B-> one indi, All: 3 indis

All clicked:

Originally posted by @arbor95 in https://github.com/fisharebest/webtrees/issues/5000#issuecomment-2196323256

postscript: (do not wonder) I changed setup to show list of Given Names in case of more than 2.