Inspire keywords not found when changing language

**Describe the bug**
When switch between languages while editing records, the INSPIRE keyword saved in French is not recognized in English version.

**To Reproduce**
Steps to reproduce the behavior:
1. Remove all languages except French in `Settings > Language and translations` and `Settings > User Interface > Top toolbar > List of languages`
2. Import a record and add an INSPIRE keyword like `Adresses` (shows in French correctly).
3. Re-add English in configuration and switch to it.
4. Edit the record (should already display the error) and save it directly.
5. Even if anchor is selected, it doesn't work.

**Expected behavior**
Should at less recognize a metadata record with an anchor link independently of the lang.

E.g : the following anchor in english
`Addresses`

Should be recognize in a monolanguage environment.

**Screenshots**

**Desktop (please complete the following information):**
- Browser: Chrome
- GeoNetwork Version : 4.2.7
- Server Application : Jetty with Java 11

Reproduce the language-switching workflow in Settings > Language and translations and the record editor using the French INSPIRE keyword “Adresses” and its English anchor. Trace the metadata validation path that handles INSPIRE keyword anchors across languages; done when the saved anchor is recognized and the record can be edited and saved in a monolingual English environment.

Written by the indexing model from the issue text.