Don't show combobox menu with only one item
Fix misspelling
Show all combobox entries when clicking the caret (fixes #1755)
Make the combobox caret a larger target
Add translated name tag only when language and value are both present

Fixes #1796
Fixes #1797
Fix changing localized language
Disable removing incomplete relation members (fixes #1768)
Fix adding localized value before name (#1797)