feat(server): introduced eissn in collection metadata
Targets: #1404 (closed)
Changes:
- In the Collection metadata template,
- Renamed 'ISSN' to 'Print ISSN'.
- Added a new field called 'Electronic ISSN'
- Introduce a new restriction to the Print ISSN and Electronic ISSN fields to only accepts ISSN's in the format
- If a collection metadata has values in 'Print ISSN' and/or 'Electronic ISSN' add it to the collection metadata that we write when the collection is previewed or published (loaded to PMC).