Adapt the link on the source text copied as template for translation

* Introduce $.fn.adaptLinks
* Link adaptation does not have any UI now. It happens when user clicks
  on the placeholders in translation column or sections in the source column.
  When source text is copied, links are translated-technically the href values
  of links are modified

Change-Id: I2be61a4c9d7e550d8106399db04290737daa6bc3