Piccolo-admin

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Fixed a bug with array inputs in custom forms (thanks to sinisaos for this).

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Added CSP (Content Security Policy) middleware to stop malicious SVG files from
executing JavaScript. This was possible if:

* Local media storage was enabled
* SVG uploads were allowed from untrusted sources
* When viewing an uploaded SVG in Piccolo Admin, if you open the SVG in a new
tab then it's possible for JavaScript embedded in the SVG file to run.

It's recommended that you upgrade to this version. Thanks to Skelmis for this.

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Fixed a bug with the bulk update button not being translated.

Thanks to jrycw for reporting the issue, and sinisaos for the fix.

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Added translations for Traditional Chinese (thanks to jrycw for this).

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Fixed a bug with filtering ``Array`` columns when choices are defined. Thanks
to sinisaos for discovering the solution.

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Fixed a bug with ``Array`` columns which have choices defined. Both a
``select`` and ``input`` widget were being shown.

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