Download dictionaries from here:
Extract the dictionaries and go to Edit/Dictionaries/Sources/Files. Then add the folder where you extracted the dictionares and rescan.
You can find mophologic ditionaries in /usr/share/hunspell/. Install them installing myspell packages.
To change the icon of the new dictionaries create an icon with a image-editor sofwate and place it in the same folder from the dictionary, with the same name of the dictionary (only the extension might be different).