Set site_name and signature email variables for alerts

so we can include the name of the site non TT templated emails
Update alert-problem-area.txt
Update alert-problem-council.txt

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Update alert-problem-nearby.txt

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Update alert-problem-ward.txt

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Update alert-problem.txt

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update tests for new alert text
Update confirm_report_sent.txt

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Update login.txt

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Update partial.txt

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Update problem-confirm.txt

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Update questionnaire.txt

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Update reply-autoresponse

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Update update-confirm.txt

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Update completed-open.html

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remove FixMyStreet cobrand alert templates