* 🐛 Add the 'pattern' parameter with the unicode Cyrillic block regex to the CKEditor mentions config.
* Revert "🐛 Add the 'pattern' parameter with the unicode Cyrillic block regex to the CKEditor mentions config."
This reverts commit 1f5ac000b6.
* 🐛 Rewrite the CKEditor Mentions plugin regexp to make it suitable for all Unicode alphabets.