Simplify the steps to add history to metadata

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 17454

Redmine category:metadata

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Open a vector layer properties dialog --> Meatadata, History
Clicking the + button opens a not that large "line edit box" to enter the history

I think that it should directly add a link and enable it to edit (in blue background?). People could hence add a longer history text. Would be more confortable and save some clicks and dialog resizing.