[ticket/11345] Change font for buttons

Change font to Open Sans

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[ticket/11345] Add Droid Sans as fallback font

PHPBB3-11345
[ticket/11345] Move css import to template

PHPBB3-11345
[ticket/11345] Wrap remote webfonts in S_ALLOW_CDN.

PHPBB3-11345
[ticket/11345] Don't include scheme, so HTTPS is used where necessary.

PHPBB3-11345
[ticket/11885] Fix migrations error

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Merge pull request #1750 from EXreaction/ticket/11885

[ticket/11885] Fix migrations error
[ticket/11608] add basic search functional test structure

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[ticket/11608] Skip tests for unsupported search backends

PHPBB3-11608
[ticket/11608] complete search tests functionalities

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[ticket/11608] Use assertions in test

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[ticket/11608] Add more assetions in tests

PHPBB3-11608
[ticket/11608] Logout before searching
Keyword search in search functional tests should be
performed as guests rather than logged in as admin.

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[ticket/11608] Mark sphinx test as incomplete
Sphinx search for the test board cannot be tested

PHPBB3-11608
[ticket/11608] Check for word highlights in search results
Search tests check for highlighted words in search results

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[ticket/11608] split search tests into separate files

Tests for each search backend are into their own separate files.
These separate classes inherit from a common search test case class.

PHPBB3-11608
[ticket/11608] Use assertContainsLang to compare language strings

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[ticket/11608] Use assertEquals for more accurate assertions

PHPBB3-11608
[ticket/11608] Set sphinx id from test_config file for tests

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[ticket/11608] pass keywords to search_found and search_not_found test

PHPBB3-11608