This plug-in provides a command for changing the dictionary used in the current view. To switch for instance to the English dictionary, execute the "Switch language: en_GB" command.
To install this plug-in simply clone this repository into your "Packages" directory:
cd ~/Library/Application\ Support/Sublime\ Text\ 2/Packages
git clone https://github.com/zerok/Sublime2-SwitchLanguage.git SwitchLanguage
SwitchLangauge creates a command for every dictionary it can find in your Packages directory. To initialize the commands, execute "Update Language Commands"
This is so far just the initial release but, at least for me, it seems to work If you find any problems, please use the issue-tracker on the project page.