fix: github -> bitbucket
add: subject (as select) to incoming_letters
fix: en.yml
add: subject for outgoing_letters
add: incoming_issue and outgoing_project
add: incoming_issues for #show
del
add: project_menu and project_id in filters
fix: add_to_description -> IncomingIssue
add: project in _form for outgoing_letters
add: project_id to incoming_issues
fix: for_project in incoming_issue
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