Detect RTL text input and style appropriately

[tommorris]

Fairly niche use case (and I don't expect anyone to be crazy enough to implement it other than me), but useful to enable international use: detect Hebrew and Arabic text input and then style the display so that those text fields are aligned right.

Rough idea how to implement this:

Take the string, use the .mb_chars method that Rails mixes into strings, then check to see that whether 50% of the characters or more are in any of the following ranges:

Hebrew - U+05D0 to U+05EA, U+05F0 to U+05F2, U+05BE, U+05C0, U+05C3, U+05F3, U+05F4, U+05B0 to U+05C4, U+0591 to U+05AF.

Arabic - U+0600 to U+06FF, U+0750 to U+077F, U+FB50 to U+FDFF, U+FE70 to U+FEFF, U+10E60 to U+10E7F.

If so, set a flag on the text that makes it so it is displayed with a dir attribute set to "rtl". Style appropriately.