Standardise identifier display for titleInstances and relatedTitles

Summary:

Currently the identifier types displayed for a title instance with type == serial (in a titleInstance card) are:

• ezb
• zdb
• eissn
• pissn

The identifier types displayed for a related title (relatedTitleInfo.js) are:

• ezb
• zdb
• eissn
• issn

In both cases the list of identifiers should be the same and should be the combination of the two sets:

• ezb (label "EZB")
• zdb (label "ZDB")
• eissn (label "ISSN (Online)")
• pissn (label "ISSN (Print)")
• issn (label "ISSN")

nb this is a change to the label `identifier.issn` which is currently "ISSN (Print)" and will become "ISSN"

User story statement(s):

As a erm librarian
I want to see an ISSN if it exists
so that I know I'm viewing the correct journal

Scenarios:

Scenario:

• Given a title instance
  • with an identifier in the `issn` namespace
• When I see view the title instance
• Then I should see the identifier from the `issn` namespace, labelled "ISSN"

Scenario:

• Given a related title instance
  • with an identifier in the `issn` namespace
• When I see view the related title instance
• Then I should see the identifier from the `issn` namespace, labelled "ISSN"

 Dev Task Breakdown:

• These files need to both render the same set of resource identifiers as mentioned in this story.
  • SerialResourceInfo 
  • RelatedTitleInfo
• The translation for ISSN (Print) needs to be changed to ISSN