[downloadable] fix filename in HTTP header (closes #2522325, #2522324) Before this changeset we use the `filename` header with utf8 encoded filename all the time. However RFC6266 says: The parameters "filename" and "filename*" differ only in that "filename*" uses the encoding defined in [RFC5987], allowing the use of characters not present in the ISO-8859-1 character set ([ISO-8859-1]). Therefore, we alter the code to: 1. Use `filename` and `ascii` encoding whenever possible, 2. use `filename*` with `utf8` encoding otherwise (with a filename fallback for old browser) We also switch the `content-disposition` value to attachement if filename is specified, this will result as a mandatory download according to RFC6266. This mandatory download is the expected behavior. We changes the filename encoding to RFC5987 which is simpler, supported by all and modern browser (including IE from version 6) and does not suffer from the continuation issue. (see ticket #2522324 for details)

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# -*- coding: utf-8 -*-

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#

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# Put here information about external resources / styles used by your cube,

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# or to overides existing UI properties.

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#

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# Existing properties are available through the `sheet` dictionary available

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# in the global namespace. You also have access to a `data` function which

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# will return proper url for resources in the 'data' directory.

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#

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# /!\ this file should not be imported /!\

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# CSS stylesheets to include in HTML headers

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# uncomment the line below to use template specific stylesheet

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# STYLESHEETS = sheet['STYLESHEETS'] + [data('cubes.%(cubename)s.css')]