[59696] changed the 'Text' tab of the classic editor to 'Code' but Code was already used as a key in the array of translatable text. Since arrays keys need to be unique, this meant that it is possible for the wrong translation to appear in a locale. Using different keys fixes that.
Reviewed by joedolson.
Merges [60182] to the 6.8 branch.
Props joedolson, sabernhardt, justlevine, swissspidy, audrasjb.
Fixes#63269. See #38061.
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