Metadata editor / Fix display of multiple choice elements with custom label

[josegar74]

Elements that define a btnLabel value and define multiple choices, like:

<element name="gmd:DQ_Result" id="128">
    <label>Ergebnis</label>
    <btnLabel>Ergebnis</btnLabel>
...
</element>

Are displayed with a wrong font due to FontAwesome styling applied wrongly to button elements:

After the fix:

Checklist

• I have read the contribution guidelines
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
• Clean commit messages, longer verbose messages are encouraged
• API Changes are identified in commit messages
• Testing provided for features or enhancements using automatic tests
• User documentation provided for new features or enhancements in manual
• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation