Use old language file selection when no default file exists #3110
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Issue #3108 points out that many existing themes rely on the old but incorrect way of selecting language files prior to the pull request #3069 which fixes the incorrect behaviour.
This PR makes a small change so that when no language is configured and no default language file exists then the fallback is to use the old method of selecting a language file rather than not selecting any file.
A single test has been added to confirm that the first language file added will be used as the fallback.