Launchpad currently recommends translating
language-pack-si-base in Ubuntu Mantic.
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Either this project has not been set up to use Launchpad for translation, or language-pack-si-base in Ubuntu Mantic does not have any strings to be translated through Launchpad. If you think this is incorrect, please see if the subject has already come up under Answers. If it hasn't, file a new question there. Thank you.