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Merge pull requestsymfony#3250 from bicpi/asterisk_alternative_for_required_form_fields

[Cookbook][Forms] Add Asterisk alternative using CSS

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Original file line number	Diff line number	Diff line change
`@@ -896,6 +896,17 @@ original template:`
`896`	`896`
`897`	`897`	See:ref:`cookbook-form-theming-methods` for how to apply this customization.
`898`	`898`
	`899`	`+..sidebar::Using CSS only`
	`900`	`+`
	`901`	+ By default, ``label`` tags of required fields are rendered with a
	`902`	+ ``required`` CSS class. Thus, you can also add an Asterisk using CSS only:
	`903`	`+`
	`904`	`+ ..code-block::css`
	`905`	`+`
	`906`	`+label.required:before {`
	`907`	`+content:"*";`
	`908`	`+ }`
	`909`	`+`
`899`	`910`	`Adding "help" messages`
`900`	`911`	`~~~~~~~~~~~~~~~~~~~~~~`
`901`	`912`

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