Fix modals (#175)

* Make modals appear correctly

* Fix failing tests and update some dependencies

e2e tests were failing due to outdated Chromedriver.

* Update package.json

Ran `npm audit --fix`

* Build the site

* Fix layout

Footer 'Donate' button did not fit in a 1/4-sized column on tablet-sized layout, so the the app had a white margin on the right. Making all columns the same size on tablet size fixed this issue. Navbar menu burger button also had a gray background which was set to white.

* Build the site

* Fix Russian typo

Author: obulat