[Bug 984315] Fixing flexboxes in contact button

[Bug 984315] Add "carrier" class to the element

[Bug 984315] Proper HTML & styles for the carrier

[Bug 984315] Displaying coma when needed

[Bug 984315] Console logs removed

[Bug 984315] Contact button flex fix

[Bug 984315] Call icon padding fix

[Bug 984315] Moving styles to CSS

[Bug 984315] Last polishing

[Bug 984315] Tests update

[Bug 984315] Use L10N instead of plain text

[Bug 984315] New tests for contact details

[Bug 984315] Lint fixes

[Bug 984315] CSS fix for button padding

[Bug 984315] Merge fix
Merge pull request #17390 from michalbe/polish-button-content

Bug 984315 - Fixing flexboxes in contact button