Optimize space bar

[Rayanox]

In 'YoutubeKeyboardTextCommandFactory', I just have to put the space button in the middle of the line array, it will a few reduce the number of commands necessary to access the space button.

Just replace :
{ new KeyNode(' '), null, null, null, null, null, null, null }
with
{ null, null, null, new KeyNode(' '), null, null, null, null }

Then check that the unit tests still run

[Rayanox]

In fact, the test have to be adapted