fix: select existing tag name in langtag canonicalization#313

mcdurdin merged 1 commit intomasterkeymanapp/api.keyman.com:masterfrom

fix/312-select-first-matching-language-in-langtag-canonicalizationkeymanapp/api.keyman.com:fix/312-select-first-matching-language-in-langtag-canonicalizationCopy head branch name to clipboard