Update "Submit" -> "Save" as discussed in #3319 (#3325)
Update "Submit" -> "Save" as discussed in #3319 (#3325)

In German UI, "Submit" (Abschicken) is almost never used. Instead, people are used to have "Save" (Speichern) as text on their buttons.
https://github.com/FreshRSS/FreshRSS/issues/3319
Alkarex/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,marienfressinaud/FreshRSS,marienfressinaud/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS