* refactor(css): add global classes for common icon types
* refactor(css): target child SVGs instead of creating new icon classes
* fix: fix ButtonWithDropdown style class spacing
* fix: set editRequest attribute for RequestModal
* fix: remove now-unneeded conditional
* fix(ui): only show 'View Request' for user's own requests if they don't have MANAGE_REQUESTS perm
* fix(ui): show edit button on request list for own requests & 'View Request' button on series pages
* fix(ui): do not show 'Request More' if user already has a pending request
* fix: address PR comments
* fix(lang): edit usercreatedfaileexisting string & generate translation key
* fix: users should always be able to view/edit their own requests even if their perms have changed
also fixed capitalization of 'Signing In...' string
