[$20] Adding link for final fixes button text is different in states.

[RishiRajSahu]

the button text changes during different states. It should stay the same:
"Add link" becomes "Add a link".

continued from #2301

[maxceem]

@vic-topcoder is there any other cases where would you like to apply the same approach:

1. Add specification !== Add link:

   

   

2. Add a desgin link !== Add a link:

   

   

[vic-georgiev]

Correct - the label of the button should be consistent:

"Add specification link", "Add design link" as call to action (first instance, open interface to add link). Title of modal is the same as button label:

"Add specification link", or "Add design link"
buttons: "Cancel", "Add link"

[Gauravseta]

@maxceem pls assign to me

[Gauravseta]

@maxceem PR done #2596

[maxceem]

@Gauravseta I've checked the PR, please, have a look #2596 (review)