Copy changelog for 5.104

     They are automatically updated with "ant bump-version".

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<changelog>

    <release version="5.104" versioncode="23040">

        <change>Fixed crash when selecting multiple messages on Android 5.1</change>

        <change>Fixed settings export</change>

        <change>Fixed some layout bugs</change>

        <change>Added Serbian translation</change>

        <change>Updated several translations</change>

    </release>

    <release version="5.103" versioncode="23030">

        <change>Added ability to customize lock screen notifications (Android 5.0+ only)</change>

        <change>Fixed a bug where a certificate error was wrongly reported</change>