Searching modules does not work correctly with umlauts. The string "eä" returns a subset of all modules but it appears like neither "eä" nor "eau" are found inside. Seaching for "ü" finds all modules in example client. It appears it is not searched for "ea" in the case of "eä" as search string because then a lot more modules would be found.
Steps to reproduce:
Go to module list
Search for umlauts such as "eä"
Take a look inside modules for the search string