How to install spell checker
Spell checker relies on 'aspell' to be installed.
Summary
To enable spell checker, the package 'aspell' needs to be installed on the server side. TinyMCE calls a web service 'v1/spell' to check spelling and store words in the user's dictionary.
Usage
When the user clicks the spell check button the text is sent to the server via the web service 'v1/spell' and resulting errors and suggestions are sent back and highlighted for the user.
Web Service
A web service "v1/spell" allows for the checking of misspelled words and maintenance of the user's private dictionary.
Linux installation
sudo apt-get install aspell