Hi Mark and welcome aboard!
You should start reading documentation - Translation. If you want your work being published here at download.moodle.org, read also about CVS repository or ask Koen to handle this for you.
Let me slightly correct Karoly's valuable comment: if you plan to become the language pack maintainer, you should assign yourself a capability to edit so called master language pack. Then you will be able to edit core language files. The _local folder is meant for local customizations on other servers.
Translating Moodle into Jawi
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