Added hover text to indicate source of example sentences during example selection -- hover over any row in the table to view the source of the example.

Updated to fix bugs which were occurring for Arabic to English, Hebrew to English, English to Arabic, and English to Hebrew

Examples are now presented in a textarea element so that they can be edited. Added a button to automatically copy the text of the examples to the clipboard.

Saved examples are now displayed in the same tab, as the prior code for writing them to a new tab was causing a cross-origin security error in Firefox.