Ftw.keywordwidget

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- Automatically open the search menu for single value fields. [mathias.leimgruber]

- BugFix: Fix JS error on single value fields. [mathias.leimgruber]

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- BugFix: No longer add items if they're not "really" selected.
[mathias.leimgruber]

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- Removed superfluous `for` attribute for a behavior without a `factory` configured. [phgross]

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- Added french translations.
[phgross]

- BugFix: Do not use the value as id in the search endpoint.
[mathias.leimgruber]

- BugFix: Get stored terms by token not by value, since self.value stores the widget value.
[mathias.leimgruber]

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- Add testbrowser widget for Keywordwidgets with async option.
[mathias.leimgruber]

- No longer load keywordwidget JS inline in the widget.
[mathias.leimgruber]

- Implement new async option.
[mathias.leimgruber]

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- Implement new option to create new terms with unicode values instead of utf-8.
[mathias.leimgruber]