Some devices don't support emoji's and display a series of `?` chars.
Instead of that, replace them by `:<emoji>:` text, e.g. `A 🐱` is
replaced by `A 🐱`.
This is done by using 'android-emojify' project and their
`EmojiUtils.shortCodify(text);` function.
For more details about this lib released under MIT license:
https://anitrend.github.io/android-emojify/
