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closes #7583

closes #7600

closes #7599

Use the already available contacts data for the prefill

Fixes #7586

Use the already available data about the recipient for the prefill

Fixes #7539

closes #7593

closes #7592

Fixes #7476

closes #7591

closes #7590

Follow-up for #7578

Fixes #7587

Fixes #7499

According to https://msdn.microsoft.com/en-us/library/dn629259(v=vs.85).aspx,
“the minimum-scale, maximum-scale, and initial-scale properties are currently
unsupported for Internet Explorer for Windows Phone“.

For further information on the viewport properties see
https://drafts.csswg.org/css-device-adapt/#viewport-meta

closes #7589

The locals option is only supported in ActionView::TestCase, so it is
ignored anyway (even worse, it disabled the complete assertion). I added
some more assertions to ensure the template is rendered with the correct
conversation.

closes #7588

This was added by accident with the rails5 upgrade

closes #7585

Fixes #7572

closes #7584

closes #7550

closes #7580

And cleanup old reshares with deleted root posts

closes #7578

closes #7576

Fixes #7424

closes #7575

closes #7568

Fixes #7563

closes #7566

closes #7565

closes #7579

This was in all stack traces, which confused people ...

We currently only support IE11, so the version check was already old
again ...

When we break old browser versions, we don't check that for other
browsers. So older IE browser just break, like very other older browser
too.

closes #7557

This was needed for IE8 and IE9

Was needed for IE8

closes #7571

closes #7570

Also add "it" as fallback for "oc" and "sc"