Make links on 'About Bitcoin Core' into clickable (squashed 5 comits into one)

Made the following links clickable:
http://www.opensource.org/licenses/mit-license.php
http://www.openssl.org/
eay@cryptsoft.com

(Squashed commits into one commit as suggested by @laanwj)

Replaced label with text browser on About Bitcoin Core Screen

So that the links on the About screen can be clickable

Replaced html property with text property

I have now removed unnecessary html so this should make life easier for
translators and you @Diapolo :). What do you think?

The size of the window needs to change

The size of the window needs to change when you make links clickable.
Thanks  for pointing that out @laanwj

Using the https://www.openssl.org over the http link

Using the https://www.openssl.org over the http link as suggested by
@Diapolo