G-Translate on Right Click wót HKSIM

Adds a new option to right-clicks context menu, "Translate with Google Translate", which translates the highlighted text on a Google Translate page.
By default the language is translated to English, and a new tab will be opened which runs Google Translate on the highlighted text. Consecutive translations will not open a new Google Translate tab (unless it has been closed), but override the existing one instead.
There is a settings page that can be accessed to change the default translation language to any of the supported languages listed here: https://cloud.google.com/translate/docs/languages
There is also an option to open the new translation tab in a pop-up window instead of a tab on the current window.