Tdf.templateuploadcenter

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- Remove an old function from the smalltemplateproject module [Andreas Mantke]
- Use only the first value of the catalog search tuple for the pattern
of the regular expressions. {Andreas Mantke]
- Remove default values of the fields for the allowed file extensions,
because this didn't work with the validation functions [Andreas Mantke]
- Update localization template and translation into Germnan [Andreas Mantke]

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- Fix the validator for linked release files and its message
text [Andreas Mantke]
- Fix the IContextAwareDefaultFactory in the linked release
module [Andreas Mantke]

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- Fix constraints for some options to upload and link template files in
the release and the linked release module [Andreas Mantke]

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- Add a title to fields description and product_description of the
tupcenter and remove their description entry [Andreas Mantke]
- Add fields to submit allowed image and template file extensions
instead of formerly hard coded file extensions for both to give
more flexibility to the site administrator [Andreas Mantke]
- Add new indexes to the portal_catalog to hold the values of
allowed image and template file extensions [Andreas Mantke]
- Create a new validator for image file extensions inside the
tupproject module and move the validation to this validator
[Andreas Mantke]
- Create new validators for template file extensions inside the
tuprelease and the tuplinkedrelease module and move the
validation to this validator [Andreas Mantke]
- Add new fields to display the currently allowed image and
template file extensions to the tupproject, the tuprelease and
the tuplinkedrelease [Andreas Mantke]
- Add subscribers for the messaging functions of the
tupsmallproject module to configure.zcml [Andreas Mantke]
- Remove old and unnecessary functions for the validation of
image and template file extensions [Andreas Mantke]
- Update localization template and German translation file [Andreas Mantke]

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- Project view for stable releases changed thus a release date is only
shown, if there is a publishing date for a release within a
project available. {Andreas Mantke]
- Update localization template and German translation file [Andreas Mantke]

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- Change fallback email sender and recipient from hard coded to the variable
site email address [Andreas Mantke]
- Remove redundant source code [Andreas Mantke]
- Update localization template and German localization [Andreas Mantke]