ephy-find-toolbar: Port to GtkSearchBar

Also fix the appearance of the prev/next buttons.

https://bugzilla.gnome.org/show_bug.cgi?id=707086
ephy-find-toolbar: Remove cast macros from places where it's not needed

https://bugzilla.gnome.org/show_bug.cgi?id=707086
Drop GtkStock

https://bugzilla.gnome.org/show_bug.cgi?id=707021
Updated Galician translations
Updated Spanish translation
data: fix distcheck again
ephy-web-view: fix the search url when settings unavailable

Another hardcoded google instance.
tests: skip tests that are breaking distcheck

These broken tests are reported in bugzilla and are blocking a
release so I'll skip them for now.
[release] 3.9.90
Updated Slovenian translation
Update Brazilian Portuguese translation, proofread by Enrico Nicoletto
Updated Irish translation
ephy-bookmark-properties: icon name should not be marked for translation

https://bugzilla.gnome.org/show_bug.cgi?id=707341
Updated Spanish translation
ephy-find-toolbar: Set view-wrapped icon according to locale's text direction
Updated Hungarian translation
Updated Lithuanian translation
Updated Polish translation
Updated Traditional Chinese translation(Hong Kong and Taiwan)
Updated Czech translation