Plone.app.i18n

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- Changed the language selector viewlet to use the native name instead of
always showing the English name. This closes
http://dev.plone.org/plone/ticket/7103.
[hannosch]

- Allow tests to force display of selector viewlet by setting
always_show_selector = True on the portal_languages tool.
[stefan]

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- Make the language selector deal with languages for which no flag is
defined. Ported over from LinguaPlone.
[wichert]

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- Fixed bug: all available languages in the languageselector box were
always marked as selected, at least when using language cookies. In
practice this meant the last language was always shown in the box and
this language was actually never used and could not be set.
[maurits]

- Added more tests. 100% test coverage now.
[hannosch]

- Added more tests for language and countries utilities. Fixed some
call-by-reference bugs with lists found while writing those.
[hannosch]

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- Undo the damage from r17682 which removed the language code from the
return value of LanguageSelector.languages. This broke the language
selectors, which is mostly noticeable by LinguaPlone no longer working.
[wichert]

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- Fixed the languages method of the selector to include the native
language code.
[wichert, hannosch]

- Fixed stupid bug in using super().
[hannosch]

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- No changes.
[hannosch]