It is off per default for Italian. So do it for German.
I (German) see the link on top of each page. and the checkmark in my prefs (https://commons.wikimedia.org/wiki/Special:Preferences#mw-prefsection-editing) is not set. the pref is titled "Narayam-Editor deaktivieren" - so it is active if the checkmark is not set.
"German [de]: umlauts and sz" is the "input method" which is provided. No one needs this. It is already available via the toolbar if someone isn't able to type it and needs it.
Useless resource trashing. Do not do it! Thanks.