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That sdb file can be edited using the SpinDB Tool from the main menu -> tools.What language did you add that was not in?
The spin syntax for each language has to be created by you. You really need to create that completely on your own or at least import the data from some other source like an open-office thesaurus.
You need to locate it online somewhere here maybe:https://extensions.openoffice.org/en/search?query=thesaurus&sort_by=field_project_stats_year&sort_order=DESC