Search function doesn't find results if diacritics/special characters are missing

I discovered this while searching for aliases of the [willow flute](https://umil.linkedmusic.ca/instrument/3714/). Two examples:

1. If you search for "seljefløyte" (with the slashed "o"), UMIL finds Willow Flute as a result. But if you search for "seljefloyte" (without the slashed "o"), UMIL finds nothing.
2. Similarly, if you search for "sälgflöjt" (with the umlauts), UMIL finds Willow Flute. But if you search for "salgflojt" (no umlauts), UMIL finds nothing.

I have a French Canadian keyboard that makes umlauts fairly easy, but I still find entering diacritics mildly annoying. I think that the search function should be able to find labels and aliases even if the diacritics are missing.