Enable parentMappingFile configuration for catalog search configurations

[solth]

Fixes #5305

[andre-hohmann]

@solth : Thanks for the PR. Technically, the first tests are successful! I can now create hierarchical processes with the parent mapping file.

However, i have observed a minor error: There are process identifier displayed to enable the selection the process to modify its metadata.
But instead of the superordinate process' identifier, it is shown the language label ger. Instead of ger, the identifier GA03538-00448249 should be displayed.

In the metadata and in the process title, the values are correct. This it seems to be rather a problem of display then a problem of functionality.
For the K10plus catalogue, the identifier are shown correctly.

[henning-gerhardt]

Changes looks good and are working but the possibility to use the translation system for the tool tip is missing - aside of missing automatic executed tests.

[solth]

However, i have observed a minor error: There are process identifier displayed to enable the selection the process to modify its metadata.
But instead of the superordinate process' identifier, it is shown the language label ger. Instead of ger, the identifier GA03538-00448249 should be displayed.

@andre-hohmann thank you very much for pointing this out. There is a bug in the logic for displaying catalog IDs in the process hierarchy during import that always expects the catalog ID metadata to be the first in the list of created kitodo:metadata nodes. Since your current parentMapping.xsl file seems to create an XML document where the first metadata in the list of metadata nodes is actually DocLanguage that metadata value is falsly taken as the catalog ID.

I will add a bugfix for this problem to this pull request.

[andre-hohmann]

@solth : With the new fix, the "ger-problem" is solved.
Thus, My tests are successful!