pgm: Externalize error message

Change-Id: Id9e33104c9681dc9a57674c1648c994a503fa6b8
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties

@@ -187,6 +187,7 @@ remoteRefObjectChangedIsNotExpectedOne=remote ref object changed - is not expect
 remoteSideDoesNotSupportDeletingRefs=remote side does not support deleting refs
 removing=Removing {0}
 repaint=Repaint
+resetNoMode=no reset mode set
 s3InvalidBucket=Invalid S3 bucket ''{0}''
 serviceNotSupported=Service ''{0}'' not supported
 skippingObject=skipping {0} {1}

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Reset.java

@@ -50,6 +50,7 @@ import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.ResetCommand;
 import org.eclipse.jgit.api.ResetCommand.ResetType;
 import org.eclipse.jgit.api.errors.GitAPIException;
+import org.eclipse.jgit.pgm.internal.CLIText;
 import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.Option;
 import org.kohsuke.args4j.spi.RestOfArgumentsHandler;
@@ -95,7 +96,7 @@ class Reset extends TextBuiltin {
 					mode = selectMode(mode, ResetType.HARD);
 				}
 				if (mode == null) {
-					throw die("no reset mode set"); //$NON-NLS-1$
+					throw die(CLIText.get().resetNoMode);
 				}
 				command.setMode(mode);
 			}

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/internal/CLIText.java

@@ -290,6 +290,7 @@ public class CLIText extends TranslationBundle {
 	/***/ public String remoteSideDoesNotSupportDeletingRefs;
 	/***/ public String removing;
 	/***/ public String repaint;
+	/***/ public String resetNoMode;
 	/***/ public String s3InvalidBucket;
 	/***/ public String serviceNotSupported;
 	/***/ public String skippingObject;