Foreign language support

[FrenjaminBanklin]

Currently it's possible for just about any unicode character to be used in Crossword. A crossword puzzle can be created in Russian, for example - the characters can be provided to the creator and a puzzle will be generated properly, and (it looks like) scoring will work properly as well.

Currently the Crossword player has an explicit list of characters that are considered 'allowed input'. These include the 0-9 digits, all English letters, and a number of accented characters common to western European languages. Any character included in a puzzle that is not in that list will be pre-filled and non-editable.

Consider keeping the current set of 'allowed characters' as a 'standard' set but also scraping additional characters from the qset to generate a 'all possible characters for this puzzle' list. Or potentially allowing widget creators to configure a list of allowed/disallowed characters.

[iturgeon]

This request comes specifically from a UCF instructor (Kyung Mee Joo) looking for Korean language support, we should focus there if general Foreign language support is too broad.

[FrenjaminBanklin]

We currently have limited support for accented characters in the form of a 'special characters' tray that can be shown/hidden at will. Might make sense to try replacing that with a virtual keyboard that supports multiple languages. May need to check out https://github.com/Mottie/Keyboard or https://github.com/klonikar/js-keyboard.