The experiments platform icons are wrongly displayed on "RTL" locales

[Softvision-RemusDranca]

[Affected versions]:

• Firefox Release 64.0 and above

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• Have a Firefox [ar] locale build installed.
• Have a new Firefox profile created.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Navigate to "https://testpilot.firefox.com/".
3. Observe the platform icons displayed on the experiments cards.
4. Click on any of the experiments card.
5. Observe the platform icon displayed on the "Install Test Pilot & Enable [experiment_name]" button.

[Expected result]:

• Step 3: There is a padding area between the experiment name and the icon.
• Step 5: The icon is correctly displayed.

[Actual result]:

• Step 3: There is no padding between the experiment name and the platform icon.
• Step 5: The platform icon overlaps the "Install Test Pilot & Enable [experiment_name]" string.

[Notes]:

• This issue is reproducible on all experiments from Test Pilot.
• A similar behavior can be observed for the following elements from the page:
  The social network icons from the footer of the page also lack the padding area between them
  The padding is also not set between the icons from the "Brought to you by" (contributor's avatar and the name/title).
• Attached are screenshots of the issue: