Externalize strings in Commit command

Change-Id: I08b2cdd147ad6f3c67795f2e75a5b5d2ce2fb20f
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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

@@ -8,6 +8,7 @@ N=N
 IPZillaPasswordPrompt=IPZilla Password
 authorInfo=Author: {0} <{1}>
 averageMSPerRead=average {0} ms/read
+branchDetachedHEAD=detached HEAD
 branchAlreadyExists=branch {0} already exists
 branchCreatedFrom =branch: Created from {0}
 branchIsNotAnAncestorOfYourCurrentHEAD=The branch '{0}' is not an ancestor of your current HEAD.\nIf you are sure you want to delete it, run 'jgit branch -D {0}'.
@@ -54,6 +55,7 @@ listeningOn=Listening on {0}
 metaVar_DAG=DAG
 metaVar_KEY=KEY
 metaVar_arg=ARG
+metaVar_author=AUTHOR
 metaVar_base=base
 metaVar_bucket=BUCKET
 metaVar_command=command
@@ -110,6 +112,8 @@ skippingObject=skipping {0} {1}
 timeInMilliSeconds={0} ms
 tooManyRefsGiven=Too many refs given
 unsupportedOperation=Unsupported operation: {0}
+usage_CommitAuthor=Override the author name used in the commit. You can use the standard A U Thor <author@example.com> format.
+usage_CommitMessage=Use the given <msg> as the commit message
 usage_CommandLineClientForamazonsS3Service=Command line client for Amazon's S3 service
 usage_CreateABareRepository=Create a bare repository
 usage_CreateATag=Create a tag
@@ -163,6 +167,7 @@ usage_portNumberToListenOn=port number to listen on
 usage_produceAnEclipseIPLog=Produce an Eclipse IP log
 usage_pruneStaleTrackingRefs=prune stale tracking refs
 usage_recurseIntoSubtrees=recurse into subtrees
+usage_recordChangesToRepository=Record changes to the repository
 usage_setTheGitRepositoryToOperateOn=set the git repository to operate on
 usage_showRefNamesMatchingCommits=Show ref names matching commits
 usage_symbolicVersionForTheProject=Symbolic version for the project

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

@@ -63,6 +63,7 @@ public static CLIText get() {
 	/***/ public String averageMSPerRead;
 	/***/ public String branchAlreadyExists;
 	/***/ public String branchCreatedFrom;
+	/***/ public String branchDetachedHEAD;
 	/***/ public String branchIsNotAnAncestorOfYourCurrentHEAD;
 	/***/ public String branchNotFound;
 	/***/ public String cacheTreePathInfo;

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

@@ -49,15 +49,15 @@
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.kohsuke.args4j.Option;
 
-@Command(common = true, usage = "Record changes to the repository")
+@Command(common = true, usage = "usage_recordChangesToRepository")
 class Commit extends TextBuiltin {
 	// I don't support setting the committer, because also the native git
 	// command doesn't allow this.
 
-	@Option(name = "--author", metaVar="author", usage = "Override the author name used in the commit. You can use the standard A U Thor <author@example.com> format.")
+	@Option(name = "--author", metaVar="metaVar_author", usage = "usage_CommitAuthor")
 	private String author;
 
-	@Option(name = "--message", aliases = { "-m" }, metaVar="msg", usage="Use the given <msg> as the commit message", required=true)
+	@Option(name = "--message", aliases = { "-m" }, metaVar="metaVar_message", usage="usage_CommitMessage", required=true)
 	private String message;
 
 	@Override
@@ -73,7 +73,7 @@ protected void run() throws NoHeadException, NoMessageException,
 
 		String branchName;
 		if (!head.isSymbolic())
-			branchName="detached HEAD";
+			branchName = CLIText.get().branchDetachedHEAD;
 		else {
 			branchName = head.getTarget().getName();
 			if (branchName.startsWith(Constants.R_HEADS))