Define About page of the application

Define the content of the AboutActivity with the logo, the version, the
Term of use, the Copyright and the license.

Signed-off-by: TAurelien <aurelien.ticot@gmail.com>
Translate About message in French and English

Add a new string.xml file for English (Default is French). This one gets
the translation of the description and the term of use.

Signed-off-by: TAurelien <aurelien.ticot@gmail.com>
Clean up the source code

Signed-off-by: TAurelien <aurelien.ticot@gmail.com>
Merge Dev_About to Master

Signed-off-by: TAurelien <aurelien.ticot@gmail.com>