Adjusted font, notification, navigator and buttons to match iOS style.

[devbucket]

Type of change

Please add an "x" into the option that is relevant:

• [ ] Bug Fix 🐛 (non-breaking change which fixes an issue)
• [ x ] New Feature 🚀 (non-breaking change which adds functionality)
• [ ] Breaking Change 💥 (fix or feature that would cause existing functionality to not work as expected)
• [ x ] Polish 💅 (Just some cleanups)
• [ ] Docs 📝 (Changes in the documentations)
• [ ] Internal 🏠 Only relates to internal processes.

[coveralls]

Pull Request Test Coverage Report for Build 1244

• 8 of 13 (61.54%) changed or added relevant lines in 8 files are covered.
• 14 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 45.692%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
themes/theme-ios11/components/Viewport/style.js	0	1	0.0%
libraries/common/selectors/client.js	0	2	0.0%
themes/theme-gmd/components/Viewport/style.js	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
libraries/common/styles/reset/root.js	1	0.0%
libraries/common/selectors/client.js	13	18.37%

Totals
Change from base Build 1241:	-0.2%
Covered Lines:	4746
Relevant Lines:	9775

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💛 - Coveralls

[fkloes]

The title is not centered anymore when there is no icon at the right position.

On the filters page the layout doesn't look nice