remove file type warning

src/main/java/org/jastadd/tooling/aspect/AspectFileType.java

@@ -2,6 +2,7 @@ package org.jastadd.tooling.aspect;
 
 import com.intellij.openapi.fileTypes.LanguageFileType;
 import org.jastadd.tooling.util.JastAddIcons;
+import org.jetbrains.annotations.Nls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -21,6 +22,11 @@ public class AspectFileType extends LanguageFileType {
     return "JastAdd Aspect";
   }
 
+  @Override
+  public @Nls @NotNull String getDisplayName() {
+    return getName();
+  }
+
   @NotNull
   @Override
   public String getDescription() {

src/main/java/org/jastadd/tooling/aspect/AttributeFileType.java

@@ -2,6 +2,7 @@ package org.jastadd.tooling.aspect;
 
 import com.intellij.openapi.fileTypes.LanguageFileType;
 import org.jastadd.tooling.util.JastAddIcons;
+import org.jetbrains.annotations.Nls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -21,6 +22,11 @@ public class AttributeFileType extends LanguageFileType {
     return "JastAdd Attribute Aspect";
   }
 
+  @Override
+  public @Nls @NotNull String getDisplayName() {
+    return getName();
+  }
+
   @NotNull
   @Override
   public String getDescription() {

src/main/java/org/jastadd/tooling/grammar/RelAstFileType.java

@@ -2,6 +2,7 @@ package org.jastadd.tooling.grammar;
 
 import com.intellij.openapi.fileTypes.LanguageFileType;
 import org.jastadd.tooling.util.JastAddIcons;
+import org.jetbrains.annotations.Nls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -21,6 +22,11 @@ public class RelAstFileType extends LanguageFileType {
     return "RelAst Grammar";
   }
 
+  @Override
+  public @Nls @NotNull String getDisplayName() {
+    return getName();
+  }
+
   @NotNull
   @Override
   public String getDescription() {