Top row keys

• fixed the backspace key (#45)
• German translations for the settings (@Schrebergarten03-links)
• French translations for the settings (@przmkg)
• Fixed a bug with adding a newline to the right / left keys
• Top row keys
• Settings button (#21)
• Fixed the enter key which was broken in some apps (#50)
• Auto capitalize (#47)
• Change the enter key's icon based on its action