Invest powerdown notify

[zobroj]

Ready to merge.
This PR:

• adds powerDown and notification to dashboard
• removes auto-fixing of inputs and replaces it with warnings
• adds a lot of i18n for messages
• resolves User is not able to type custom number in 'Power Down' field #562, 'Transaction info' link is missing #541, 'Up' and 'Down' arrow buttons are missing in input fields on the 'Dashboard' page #566
• maybe resolves as a dev, successful powerDown transaction should have a dispatched action #525

[sunify]

Suddenly, i was starting to working on this issue in Saturday before you assign yourself to it. Today i commited my fix and notice that you always working on it too :-)

Anyway, i have the solution for BigNumber limitation in my commit, so feel free to use it if you think it's ok https://github.com/sunify/ab-web/commit/dae3787920304ce9ae7108ded6cb754c120ad9ea

[zobroj]

@sunify Wow, funny timing. However, @johannbarbie helped me by suggesting to convert the numbers toString():

const validate = (values, props) => {
  const errors = {};
  const { maxAmount, minAmount = 0 } = props;
  const amount = values.get('amount');
  const stringMaxAmount = new BigNumber(maxAmount.toString());
  const stringAmount = amount ? new BigNumber(amount) : '0';

  if (!amount) {
    errors.amount = <FormattedMessage {...messages.amountRequired} />;
  }
  if (amount <= minAmount) {
    errors.amount = <FormattedMessage {...messages.amountTooLow} values={{ minAmount }} />;
  }
  if (amount === 0) {
    errors.amount = <FormattedMessage {...messages.amountZero} />;
  }
  if (stringMaxAmount && stringMaxAmount.lt(stringAmount)) {
    errors.amount = <FormattedMessage {...messages.amountTooHigh} values={{ maxAmount }} />;
  }

  return errors;
};

[zobroj]

@sunify it seems that after a user powerUp's there isn't a second action dispatched. So now there is no way to dismiss the notification after a successful transaction.

[sunify]

@VonIobro do you mean CONTRACT_EVENT action? It should be dispatched (if tx is successful ofc).

Anyway in #585 i added new actions for transactions, so we don't need events for this purpose anymore