support mms basic auth

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use Loader when conversation is updated instead of requery

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load image previews asynchronously

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Merge pull request #2178 from mcginty/async-media-preview

media preview fixes
Fix for fallback behavior.

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Notify on incoming messages when locked.

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Fixes #2149
Add Croatian language to list

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Closes #2167
Fixes #2026
Updated language translations.

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Bump version to 2.3.3

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