When custom files are found, use the base files for default values.

worldedit-core/src/main/java/com/sk89q/worldedit/command/BiomeCommands.java

@@ -106,7 +106,7 @@ public class BiomeCommands {
                             })
                             .collect(Collectors.toList()));
              return paginationBox.create(page);
-        }, null);
+        }, (Component) null);
     }
 
     @Command(

worldedit-core/src/main/java/com/sk89q/worldedit/command/UtilityCommands.java

@@ -51,6 +51,7 @@ import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.regions.CylinderRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.util.formatting.component.SubtleFormat;
+import com.sk89q.worldedit.util.formatting.text.Component;
 import com.sk89q.worldedit.util.formatting.text.TextComponent;
 import com.sk89q.worldedit.util.formatting.text.TranslatableComponent;
 import com.sk89q.worldedit.util.formatting.text.format.TextColor;
@@ -491,7 +492,7 @@ public class UtilityCommands {
                     new double[]{}, WorldEdit.getInstance().getSessionManager().get(actor).getTimeout());
             String formatted = Double.isNaN(result) ? "NaN" : formatForLocale(actor.getLocale()).format(result);
             return SubtleFormat.wrap(input + " = ").append(TextComponent.of(formatted, TextColor.LIGHT_PURPLE));
-        }, null);
+        }, (Component) null);
     }
 
     @Command(

worldedit-core/src/main/java/com/sk89q/worldedit/regions/RegionSelector.java

@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.regions;
 
+import com.google.common.collect.Lists;
 import com.sk89q.worldedit.IncompleteRegionException;
 import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.extension.platform.Actor;
@@ -158,7 +159,9 @@ public interface RegionSelector {
      * @return a list of lines describing the region
      */
     @Deprecated
-    List<String> getInformationLines();
+    default List<String> getInformationLines() {
+        return Lists.newArrayList();
+    };
 
     /**
      * Get lines of information about the selection.

worldedit-core/src/main/java/com/sk89q/worldedit/util/translation/TranslationManager.java

@@ -85,20 +85,26 @@ public class TranslationManager {
     }
 
     private Optional<Map<String, String>> loadTranslationFile(String filename) {
+        Map<String, String> baseTranslations;
+
+        try {
+            baseTranslations = parseTranslationFile(ResourceLoader.getResourceRoot("lang/" + filename));
+        } catch (IOException e) {
+            // Seem to be missing base. If the user has provided a file use that.
+            baseTranslations = new HashMap<>();
+        }
+
         File localFile = worldEdit.getWorkingDirectoryFile("lang/" + filename);
         if (localFile.exists()) {
             try {
-                return Optional.of(parseTranslationFile(localFile));
+                baseTranslations.putAll(parseTranslationFile(localFile));
             } catch (IOException e) {
-                return Optional.empty();
+                // Failed to parse custom language file. Worth printing.
-            }
+                e.printStackTrace();
-        } else {
-            try {
-                return Optional.of(parseTranslationFile(ResourceLoader.getResourceRoot("lang/" + filename)));
-            } catch (IOException e) {
-                return Optional.empty();
             }
         }
+
+        return baseTranslations.size() == 0 ? Optional.empty() : Optional.of(baseTranslations);
     }
 
     private boolean tryLoadTranslations(Locale locale) {