Point 1 : Undo button not correctly working (on description and on answer). 

• Open a subject
• In area to add an answer, enter a text
• Click on "Undo" button => Written text should be removed. It is not the case : custor is only set at the beginning. 

Point 2 : Impossible to remove "Bold" style when there is no selection (on description and on answer)

• Open a subject
• In area to add an answer, click on Bold button. 
• Enter a text, this text is in bold. 
• Click on Bold button (in order to remove bold style to future entered text) => Nothing happens. 

Point 3 : Same as Point 2 for Italic text