(Feature) Improvements in the crowdsale list and manage section

[mariano-aguero]

Relates to #1237

Usability improvement crowdsale list:

• When selecting a crowdsale, the app must scroll until the continue button
• If you resize the screen, the address field does not enter completely

Usability improvement manage section:

• The crowdsale page link must be a link with a target _blank

[dennis00010011b]

Crowdsale list: should be button 'Back'