Issue #582 - Use function convertVestsToHP instead of manual calculations

Dima Rifairequested to merge
delrifai/#582_vest_tooltip_fix into develop
  1. I have used function convertVestsToHP which is used to make the calculations instead of the current calculations
  2. HP now appears instead of VESTS and value is well formatted according to locale
  3. Tested this for producer_reward, curation_reward, comment_rewards, author_reward, claim_reward_balance, author_reward, comment_benefactor_reward, pow_reward

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