Please define "don't seem to have allowed me to keep it" - what happened? Are they just not there? Were there error messages? Updates will never destroy user-created data, because that is always stored in separate files, and HL doesn't overwrite them.
To create new languages, open the editor from the Tools menu, create a new data file in the editor, and save it to the default directory, then go to the language tab, and start making new entries, and press the Test Now! button at the top as you finish each one.
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