Localisation updates from https://translatewiki.net.

Change-Id: I8879597677f7b8fb7dcf36068834c6b64fc1e00c
Localisation updates from https://translatewiki.net.

Change-Id: I6f2bcd65d1121334cb9a8325530823d3cf9170d9
Make Special:HideBanners set a P3P header for IE

This patch adds the new global variable
$wgCentralNoticeHideBannersP3P for setting a site's P3P header.

If that variable is set to false, we will:
- Send an invalid header.
- Add a Special:HideBanners/P3P page with an explanation of
the invalid header.

This follows a similar practice in the CentralAuth extension.

Change-Id: I34c8937165dcbc425d546e7538300a988b99a4f8
Localisation updates from https://translatewiki.net.

Change-Id: I550a90377268002fef8c1c1b765e257872f536a6
Add more browsers to cross-browser tests

Change-Id: Ic8f618d63975ee0a4554a0c5f098f062ca6b9b22
Merge master into wmf_deploy

1dde9c7904c5de1e1a440f5f76c255b8f708fe6a Localisation updates from https://translatewiki.net.
794e90b712f130a27f99e9ada5cccfe1286e6f8e Localisation updates from https://translatewiki.net.
4dc1eab82db6e5c379931bfb68e592304b499626 Make Special:HideBanners set a P3P header for IE
9f8c88de3b9d95cd489604e83a97a83ccfca4dc7 Localisation updates from https://translatewiki.net.
917a36f95b1c5efd50e53f266946587d13cedb28 Add more browsers to cross-browser tests

Change-Id: Ied21e92978056522b434c0624d2bfe61b172e255