Various changes and bugfixes

• Fixed 'import failed' screen being shown while fixing conflicts
• Updated link to duplicated contacts from import summary
• Replace 'send pitch' and 'store coverage' on contact view page
• Improve autosaving of pitch to pitch drafts
• Prevent using custom sender addresses for Canceled trials
• Fixed bug with save warning on newsroom boilerplate
• Improved of recently uploaded images throughout Prezly
• Fixed sender addresses dropdown overflow
• Fixed case where Coverage preview image was not working
• Add (Global) labels to global versions of multi-country locales: ar, de, es, fr, en, nl, pt
• Hide region names in newsroom language switcher if possible
• Fixed case where newsroom logo would be unset while changing look and feel settings
• Various WCAG compliance fixes on newsrooms