Change attributes to align image

[jml-french]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
When align image, the alignment works only on suneditor.

Describe the solution you'd like
A clear and concise description of what you want to happen.
The problem is that '__se__float-none', '__se__float-left', '__se__float-center', '__se__float-right' are not portable.
I propose to replace this attributes by 'nothing', 'align = "left"', 'align = "center"' and 'align = right' respectively.
-> I try this solution and it's work well for save and edit after.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
Idem

Additional context
Add any other context or screenshots about the feature request here.
Nothing else