SONAR-11802 fix description of metric "sqale_index"

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

@@ -1980,7 +1980,7 @@ metric.skipped_tests.short_name=Skipped
 metric.sqale_debt_ratio.description=Ratio of the actual technical debt compared to the estimated cost to develop the whole source code from scratch
 metric.sqale_debt_ratio.name=Technical Debt Ratio
 metric.sqale_debt_ratio.short_name=Debt Ratio
-metric.sqale_index.description=Total effort (in days) to fix all the issues on the component and therefore to comply to all the requirements.
+metric.sqale_index.description=Total effort (in hours) to fix all the issues on the component and therefore to comply to all the requirements.
 metric.sqale_index.name=Technical Debt
 metric.sqale_index.short_name=Debt
 metric.sqale_rating.description=A-to-E rating based on the technical debt ratio

sonar-core/src/test/java/org/sonar/core/i18n/DefaultI18nTest.java

@@ -41,7 +41,7 @@ public class DefaultI18nTest {
 
   private TestSystem2 system2 = new TestSystem2();
 
-  DefaultI18n underTest;
+  private DefaultI18n underTest;
 
   @Before
   public void before() {

sonar-plugin-api/src/main/java/org/sonar/api/measures/CoreMetrics.java

@@ -1935,7 +1935,7 @@ public final class CoreMetrics {
    */
   // TODO should be renamed to MAINTAINABILITY_REMEDIATION_EFFORT
   public static final Metric<Long> TECHNICAL_DEBT = new Metric.Builder(TECHNICAL_DEBT_KEY, "Technical Debt", Metric.ValueType.WORK_DUR)
-    .setDescription("Total effort (in days) to fix all the issues on the component and therefore to comply to all the requirements.")
+    .setDescription("Total effort (in hours) to fix all the issues on the component and therefore to comply to all the requirements.")
     .setDomain(DOMAIN_MAINTAINABILITY)
     .setDirection(Metric.DIRECTION_WORST)
     .setOptimizedBestValue(true)