Update display error message for Luthor when Wikisource is unavailable
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Updated the 500 error page to display a clearer message: "There is no Wikisource for this language." This enhances user understanding when a Wikisource is not available for the selected lexeme.
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Additionally, I can implement a more detailed message such as "The lexeme LXXX is in YYY [language] but there is no Wikisource for this language" by modifying the @usage_controller.rb if desired.