Feature: Add feedback for empty attributes in concepts

[haddadzineddine]

Description

When selecting a specific language, it is possible that the Preferred Name and prefLabel attributes may be empty. To inform the user that these attributes do not have a value in the selected language, we need to add feedback.

Screenshots:

1. synonyms and definitions :
   

2. prefLabel :
   

3. Preferred name :
   

Reviewers

@syphax-bouazzouni

[syphax-bouazzouni]

As discussed in our last meeting:

• Show the warning only if the preferred name is empty
• Do a better style and reuse the alert component

[syphax-bouazzouni]

We will need a screenshot when done

[haddadzineddine]

[haddadzineddine]

In this scenario, I display the alert message regardless of the existence of the preferred name, simply to demonstrate that it functions properly.

@syphax-bouazzouni

[syphax-bouazzouni]

Added:

• Add padding the concept details no prefLabel warning (d9d463b)
• Make the concept details no prefLabel alert closable (236d86f)
• In the concepts treeview the ones with no prefLabel show only their id last part (ae916ac)