Improve ux of comment cards

General:

• Use staggered font sizes according to device size
• Use line height according to a11y recommendations
• Stop using random increase of icon size in icon buttons

Creators:

• Use different displaying of the voting score to save vertical space and explain meaning of this number
• Enhace wording of comment actions like reply, mark as correct etc.

Participants:

• Show info icons with lower opacity since there are no action for participants
• Make some minor adjustments

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Closes #822 (closed)