Externalize error message in ReftableWriter#throwIllegalEntry

Also use MessageFormat as done elsewhere.

Change-Id: I36a4df9002310fa28321de9d325ee213f3cbd433
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties

 refAlreadyExists1=Ref {0} already exists
 reflogEntryNotFound=Entry {0} not found  in reflog for ''{1}''
 refNotResolved=Ref {0} cannot be resolved
+refTableRecordsMustIncrease=records must be increasing: last {0}, this {1}
 refUpdateReturnCodeWas=RefUpdate return code was: {0}
 remoteConfigHasNoURIAssociated=Remote config "{0}" has no URIs associated
 remoteDoesNotHaveSpec=Remote does not have {0} available for fetch.

org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java

 	/***/ public String refAlreadyExists1;
 	/***/ public String reflogEntryNotFound;
 	/***/ public String refNotResolved;
+	/***/ public String refTableRecordsMustIncrease;
 	/***/ public String refUpdateReturnCodeWas;
 	/***/ public String remoteConfigHasNoURIAssociated;
 	/***/ public String remoteDoesNotHaveSpec;

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableWriter.java

 
 import java.io.IOException;
 import java.io.OutputStream;
+import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.zip.CRC32;
 
 import org.eclipse.jgit.annotations.Nullable;
+import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.internal.storage.reftable.BlockWriter.DeleteLogEntry;
 import org.eclipse.jgit.internal.storage.reftable.BlockWriter.Entry;
 import org.eclipse.jgit.internal.storage.reftable.BlockWriter.IndexEntry;
 	}
 
 	private void throwIllegalEntry(Entry last, Entry now) {
-		throw new IllegalArgumentException(
-			String.format("records must be increasing: last %s, this %s",
+		throw new IllegalArgumentException(MessageFormat.format(
+				JGitText.get().refTableRecordsMustIncrease,
 				new String(last.key, UTF_8), new String(now.key, UTF_8)));
 	}