Moodle stores strings for TinyMCE editor in editor_tinymce component. TinyMCE project is already localized (fully or at least partially) into many languages - see http://tinymce.moxiecode.com/download_i18n.php for the overview.
I have used a custom tool (originally written by Petr Škoda - credit goes to him) that fetches the upstream language packs from TinyMCE and converts it into Moodle format so that it can be uploaded into AMOS. This way, you do not need to re-translate what is already done and also you keep the Moodle translation of TinyMCE consistent with upstream.
- See the Folder in this course at http://lang.moodle.org/mod/folder/view.php?id=13
- Locate the directory with the language code you are maintaining and download the file xx/editor_tinymce.php (where xx is your language code)
- Upload the file back into the empty AMOS stage
- Rebase the stage to keep just modified and missing strings
- Review the translation
- Commit the stage
Hot tip! Thanks to the new cool File management in Moodle 2.0, you even do not need to download the file and upload it back to AMOS. Just go to the AMOS stage, open the file picker and navigate into System/Courses/Translating Moodle/Upstream translation of TinyMCE (Folder)/Files and subfolders/ and you can choose the file from there directly!
If your language is missing in the folder but your language is published at the TinyMCE i18n page, please let me know. Currently, I am unable to transform Chamorro and Chinese due to encoding problem in XML sources. If you spot any other problem, let me please know too.
Hope this helps!