Overwrite color for icons on highlighted buttons
Merge pull request #1457 from opf/feature/4752_button_contrast_in_cost_report

[Fix] 4752 button contrast in cost report
Update CHANGELOG.md
release/3.0: fixes fickle spec
Merge pull request #1490 from marutosi/finn/release/3.0/fixes-fickle-spec

release/3.0: fixes fickle spec
Merge branch 'release/3.0' into dev

Conflicts:
	app/assets/stylesheets/fonts/_openproject_icon_font.sass
	doc/CHANGELOG.md