Add icon to easily launch virtual keyboard

Nobody was blocked by the default keyboard not being their usual one but many did typos. I wonder how would this be for people using non-Latin scripts. In case people really can’t make it to select their language with the mouse of the default keyboard, maybe a virtual keyboard would help. That’s anyway something we want to integrate in the Greeter to protect from keyloggers but that’s quite some work.

Parent Task: #12069 (closed)

Related issues

• Related to #5563 (closed)
• Related to #11430 (closed)

Original created by @alant on 10814 (Redmine)