Feature request: Add a character table with umlauts and other special characters

[janschreiber]

I've been thinking about how OT could help (a) users with non-German keyboards, (b) users who are struggling with entering common accented characters that often occur in loan words, such as à, é, ç, ğ etc., because the process of entering those on their respective device might be cumbersome or not widely known.

The basic idea is that OT could have an icon (or maybe a text that says "Sonderzeichen") next to each input field that when clicked/touched opens a modal (?) dialog that displays special characters from at least German, French, Italian, Spanish, and maybe Polish, Czech, and Turkish, typically in a table of some kind. When a character in the table is clicked/touched, the respective character should (obviously) be entered at the cursor position. The dialog should probably not close automatically after insertion so the user can add several special characters in one go.

I would not restrict this to the search box, but make it available literally everywhere where users are supposed to enter text. It might encourage OT contributors to contribute with better spelling quality. My suggestion addresses the same problem that motivates issue #16, but in a more generic way.

[janschreiber]

I am currently working on this myself, but it may take some time to complete.