Tdf-extensionuploadcenter

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- Removed a redundant link from the linked release view [Andreas Mantke]
- Added download links for unstable release files to the project view, which
are displayed, if there is no stable release [Andreas Mantke]
- Add an information about the current status to the message for the
project manager, send for changing the workflow state. [Andreas Mantke]

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- Adding a function to collect the latest unstable release and a slot in
the project view to present such releases to the user [Andreas Mantke]
- Fixed link to the documentation file in the project view [Andreas Mantke]
- Updated string format handling to modern method in eupcenter.py, eupproject.py,
euprelease.py, eupreleaselink.py and bootstrap.py [Andreas Mantke]
- Add a function for search and display the license from the indexes of
the portal_catalog [Andreas Mantke]
- Update of the localization to German [Andreas Mantke]

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- Heading for release details and changelog will be hidden in the
eupreleases and eupreleaseslink view, if there is no content for
this topics [Andreas Mantke]
- Update versions of LibreOffice [Andreas Mantke]
- Add a further explanation for publishing a release and linked release
and a link to the advanced state change. [Andreas Mantke]
- Update of the internationalization template and the po-files for the
German and Spanish language [Andreas Mantke]

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- Fixed Tal-expression in views of release and linked release [Andreas Mantke]

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- Notification about a new entry in the review list added to help the reviewer. [Andreas Mantke].

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