Your last one, ask_a_question, needs a final closing bracket.
Code:
'ask_a_question' => isset($default_uri_parts[$default_language_code]['ask_a_question']) ?
$default_uri_parts[$default_language_code]['ask_a_question'] :
(isset($default_uri_parts['en']['ask_a_question']) ?
$default_uri_parts['en']['ask_a_question'] : 'Ask a Question')
(the final bracket after 'Ask a Question' matches the one on the previous line before isset).
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