Update changelog for 5.303
They are automatically updated with "ant bump-version".
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<changelog>
+ <release version="5.303" versioncode="23530">
+ <change>Fixed bug that could lead to attachments not being displayed</change>
+ <change>Fixed bug where HTML messages weren't displayed correctly</change>
+ <change>Fixed crash when encountering invalid email addresses</change>
+ </release>
<release version="5.302" versioncode="23520">
<change>Fixed display errors of plain text messages</change>
<change>Added translations: Indonesian, Breton</change>
