Delrifai/#412 verify account starts with @

Dima Rifairequested to merge
delrifai/#412_verify_account_starts_with_@ into develop
  1. Validated that account starts with @ else show the error page
  2. Validated if the account starts with @, it is also not empty, and there is a username after it
  3. Performed Sanity check on balance history and main account page to make sure all is working as expected

Changes applied for balanceHistory/@bkocktrades(balance history) and @blocktrades (main account)

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