Restyled language selector

- flags replaced with SVG speech bubble + language code
- locale switcher styled as joined button group
Styling for dashboard language picker
Specs passing

- added ids to links in #swtch_locale_picker
- modified feature spec to click on links by id, not text
Replaces flags on pages index
Specs passing
CSS tweaks

- tightened line spacing in locale icon
- lined up text in locale button on dashboard
- bottom margin in locale switcher on page edit form, so links a separated if the switcher wraps to a second line
Merge pull request #2723 from isaacfreeman/2722_locale_selectors

2722 locale selectors

Closes #2722
Create id.yml
Merge pull request #2759 from zhiephie/patch-1

Create id.yml
Locale from Indonesian

Locale from Indonesian
Merge pull request #2762 from zhiephie/patch-3

Locale from Indonesian
Place the method definition on its own line.
Merge pull request #2763 from delynn/patch-1

Place the method definition on its own line.
Update cs.yml

Added untranslated strings from en and translated to cs.
Merge pull request #2764 from prokopsimek/patch-2

Update cs.yml
Specify ruby required version via Refinery::Version.required_ruby_version.

Use it in all gemspecs.
Let's support Ruby 2.0 again.
Migrate rspec-rails ~> 3.0.
Merge pull request #2765 from refinery/dry-ruby-required-version

Specify ruby required version via Refinery::Version.required_ruby_version.
Merge pull request #2766 from refinery/use-rspec-3

Migrate rspec-rails ~> 3.0.