cleanup [java-psi]: PsiFormatUtil.getPackageDisplayName i18n, docs

GitOrigin-RevId: 89f3c0fb0a3dfcb652fd0b4d9044d3141b31d989

java/java-frontback-psi-api/resources/messages/JavaPsiBundle.properties

@@ -219,3 +219,6 @@ annotation.target.TYPE=type
 annotation.target.TYPE_PARAMETER=type parameter
 # suppress inspection "UnusedProperty"
 annotation.target.TYPE_USE=type use
+local.class=local class
+default.package=default package
+type.parameter.of=type parameter of {0}

java/java-psi-api/src/com/intellij/psi/util/PsiFormatUtil.java

@@ -11,6 +11,7 @@ import com.intellij.util.ExceptionUtil;
 import com.intellij.util.ObjectUtils;
 import com.intellij.util.VisibilityUtil;
 import org.intellij.lang.annotations.MagicConstant;
+import org.jetbrains.annotations.Nls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -466,7 +467,12 @@ public class PsiFormatUtil extends PsiFormatUtilBase {
     return builder.toString();
   }
 
-  public static String getPackageDisplayName(@NotNull PsiClass psiClass) {
+  /**
+   * @param psiClass class to get the package name from
+   * @return user-friendly additional information about class location. Usually, a package name, 
+   * but could be also a containing class of a type parameter or something like "local class".
+   */
+  public static @Nls String getPackageDisplayName(@NotNull PsiClass psiClass) {
     if (psiClass instanceof PsiTypeParameter) {
       PsiTypeParameterListOwner owner = ((PsiTypeParameter)psiClass).getOwner();
       String ownerName = null;
@@ -479,17 +485,18 @@ public class PsiFormatUtil extends PsiFormatUtilBase {
       else if (owner instanceof PsiMethod) {
         ownerName = owner.getName();
       }
-      return ownerName == null ? "type parameter" : "type parameter of " + ownerName;
+      return ownerName == null ? JavaPsiBundle.message("element.type.parameter") :
+             JavaPsiBundle.message("type.parameter.of", ownerName);
     }
 
     if (PsiUtil.isLocalClass(psiClass)) {
-      return "local class";
+      return JavaPsiBundle.message("local.class");
     }
 
     String packageName = psiClass.getQualifiedName();
     packageName = packageName == null || packageName.lastIndexOf('.') <= 0 ? "" : packageName.substring(0, packageName.lastIndexOf('.'));
     if (packageName.isEmpty()) {
-      packageName = "default package";
+      packageName = JavaPsiBundle.message("default.package");
     }
     return packageName;
   }