Find all strings for i18n in modals - Closes #744

[slaweet]

Closes #744

[reyraa]

We have a navigate function which uses tabs arrays to navigate to tabs:

const navigate = (history, tabs, index) => {
  if (!isCurrent(history, index, tabs)) {
    history.push(`/main/${tabs[index].toLowerCase()}`);
  }
};

translating tabs items breaks the navigation since the route is not defined anymore. I think we have to use objects instead of string in this array:

const tabs = [
  {
    label: t('Transactions'),
    id: transactions,
  }, {
    label: t('Voting'),
    id: voting,
  }, {
    label: t('Forging'),
    id: forging,
 },
];

[reyraa]

These translations are missing:

• settings label in menu (This has the t function called but for some reason the script couldn't index it)
• all the labels in votingBar
• The description in forging for non-delegates

[reyraa]

Thanks Vit. Great job!