Update HTML page title and description.
Add link to footer/copyright notice.
Replace textarea with text input field.

The user interface looks simpler and less intimidating with a one-line text field.

Additionally, the placeholder text is written in English and is intended to help the user using the dictionary.
Add tabbed sections.

This lets us provide help and about sections without poluting the dictionary UI.
Automatically change to the dictionary tab when translating.

This let's the user translate from any tab and naturally see the results, as expectable.
Add information about the project.