SONAR-12460 Add description to Gitlab setting

sonar-core/src/main/resources/org/sonar/l10n/core.properties

@@ -937,6 +937,7 @@ property.category.security.encryption=Encryption
 property.category.security.github=GitHub
 property.category.security.github.description=In order to enable GitHub authentication:<ul><li>SonarQube must be publicly accessible through HTTPS only</li><li>The property 'sonar.core.serverBaseURL' must be set to this public HTTPS URL</li><li>In your GitHub profile, you need to create a Developer Application for which the 'Authorization callback URL' must be set to <code>'&lt;value_of_sonar.core.serverBaseURL_property&gt;/oauth2/callback'</code>.</li></ul>
 property.category.security.gitlab=Gitlab
+property.category.security.gitlab.description=In order to enable Gitlab authentication, the property 'sonar.core.serverBaseURL' must be set to the public URL
 property.category.security.saml=SAML
 property.category.security.saml.description=In order to enable SAML authentication, the property 'sonar.core.serverBaseURL' must be set to the public URL
 property.category.java=Java