cubicweb #119938 the ui of the personal/site preferences is tedious to use [resolved]

Some sections are badly named, seem redundant, don't advertise properly their content.

There should be no "validate" button per entry, not even one global validate button : changes should be applied immediately. Possibility to reset to defaults should be there, also an action to "undo" the last immediate (session-scoped ?) changes would be welcome.

done in3.1.0
load left0.000
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