Fixed issue #8829:  Questions with errors in relevance equations are hidden

Dev: Set questions to "relevant" if there's an error in the rel equation
Updated translation: Catalan by valdomir
Updated translation: Czech by slansky
Updated translation: Greek by kiolalis
Updated translation: Spanish (Spain) by valdomir
Updated translation: French (France) by arnaud21, TGorbunovaEspace
Updated translation: Italian by lfanfoni
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Updated translation: Czech (Informal) by slansky
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