(Fix) Reserved tokens plus button is renamed to 'Submit'

[vbaranov]

Closes #486

Problem: Sometimes users forget to click "+" button to add reserved tokens because of think, that it will add another one destination address.

Solution: Rename "+" button to "submit". It is supported by community users https://gitter.im/poanetwork/ico-wizard?at=5af0880b6d98e53e045be068

@dennis00010011b please take a look. I guess this change should break e2e tests.

[vbaranov]

@fernandomg thanks, updated

[coveralls]

Pull Request Test Coverage Report for Build 2113

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 9 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 23.155%

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Files with Coverage Reduction	New Missed Lines	%
src/components/stepFour/utils.js	9	0.0%
<!--	Total:	9		-->

Totals
Change from base Build 2094:	-0.04%
Covered Lines:	640
Relevant Lines:	2396

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💛 - Coveralls

[dennis00010011b]

@vbaranov e2e changed https://github.com/poanetwork/token-wizard-test-automation/tree/master Please update submodule and try again