No we have no organisation prescribing our use of language in any official capacity. However, there are a couple of organisations that campaign for the use of Clear/Plain English, who have created a set of rules and will accredit writing that meets their standards. This is more to do with getting rid of outdated/over-formal/beaurocratic/jargon-ridden language and making sure that organisations are writing accessibly.
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In Philippine English, "officemate" is a synonym of "colleague" or "coworker" but it's not even listed in the Merriam-Webster Online Dictionary.