Undo translation of protocol string 'unpack error'

This string is part of the network protocol, and isn't meant to
be translated into another language.  Clients actually scan for
the string "unpack error " off the wire and react magically to
this information.  If it were translated, they would instead have
a protocol exception, which isn't very useful when there is already
an error occurring.

Change-Id: Ia5dc8d36ba65ad2552f683bb637e80b77a7d92f0
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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

@@ -379,7 +379,6 @@ unknownRepositoryFormat2=Unknown repository format "{0}"; expected "0".
 unknownRepositoryFormat=Unknown repository format
 unknownZlibError=Unknown zlib error.
 unmergedPath=Unmerged path: {0}
-unpackError=unpack error {0}
 unreadablePackIndex=Unreadable pack index: {0}
 unrecognizedRef=Unrecognized ref: {0}
 unsupportedCommand0=unsupported command 0

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

@@ -438,7 +438,6 @@ public class JGitText extends TranslationBundle {
 	/***/ public String unknownRepositoryFormat;
 	/***/ public String unknownZlibError;
 	/***/ public String unmergedPath;
-	/***/ public String unpackError;
 	/***/ public String unreadablePackIndex;
 	/***/ public String unrecognizedRef;
 	/***/ public String unsupportedCommand0;

org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java

@@ -1048,7 +1048,7 @@ public class ReceivePack {
 	private void sendStatusReport(final boolean forClient, final Reporter out)
 			throws IOException {
 		if (unpackError != null) {
-			out.sendString(MessageFormat.format(JGitText.get().unpackError, unpackError.getMessage()));
+			out.sendString("unpack error " + unpackError.getMessage());
 			if (forClient) {
 				for (final ReceiveCommand cmd : commands) {
 					out.sendString("ng " + cmd.getRefName()