Onegov-election-day

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- Fixes test failing due to changes in the memory backend.
[msom]

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- Sorts the elections/votes by issue date in the open data view.
[msom]

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- Uses latest onegov.user.
[msom]

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- Updates translations.
[msom]

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- Fixes the open data description translations.
[msom]

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- Adds an open data licence / terms of use.
[msom]

- Excludes XLSX from the opendata catalog.
[msom]

- Uses the date of the election/vote for the opendata issue date.
[msom]

- Uses a better description of the elections/vote in the opendata catalog.
[msom]