remove support for 'trait' keyword

j2k/testData/KotlinApi.kt

@@ -18,7 +18,7 @@ public open class KotlinClass(public var field: Int) {
     }
 }
 
-public trait KotlinTrait {
+public interface KotlinTrait {
     public fun nullableFun(): String?
     public fun notNullableFun(): String
 

j2k/testData/fileOrElement/identifier/keywords.java

@@ -1,2 +1,2 @@
 //statement
-int as, type, val, var, fun, is, in, object, when, trait, This;
+int as, type, val, var, fun, is, in, object, when, This;

j2k/testData/fileOrElement/identifier/keywords.kt

@@ -7,5 +7,4 @@ val `is`: Int
 val `in`: Int
 val `object`: Int
 val `when`: Int
-val `trait`: Int
 val `This`: Int

j2k/testData/fileOrElement/importStatement/importWithKeywords.java

@@ -1,6 +1,6 @@
 //file
 package test;
 
-import as.type.val.var.fun.is.in.object.when.trait.This;
+import as.type.val.var.fun.is.in.object.when.This;
 
 class Test {}

j2k/testData/fileOrElement/importStatement/importWithKeywords.kt

@@ -1,6 +1,6 @@
 // ERROR: Unresolved reference: `as`
 package test
 
-import `as`.type.`val`.`var`.`fun`.`is`.`in`.`object`.`when`.`trait`.`This`
+import `as`.type.`val`.`var`.`fun`.`is`.`in`.`object`.`when`.`This`
 
 internal class Test

j2k/testData/fileOrElement/methodCallExpression/callWithKeywords.java

@@ -1,2 +1,2 @@
 //statement
-when(open, trait);
+when(open);

j2k/testData/fileOrElement/methodCallExpression/callWithKeywords.kt

@@ -1 +1 @@
-`when`(open, `trait`)
+`when`(open)