builtin/add.c: clean up die() messages

As described in the CodingGuidelines document, a single line message
given to die() and its friends should not capitalize its first word,
and should not add full-stop at the end.

Signed-off-by: Naomi Ibe <naomi.ibeh69@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: Amarajah

builtin/add.c

@@ -182,7 +182,7 @@ static int edit_patch(int argc, const char **argv, const char *prefix)
 	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 
 	if (repo_read_index(the_repository) < 0)
-		die(_("Could not read the index"));
+		die(_("could not read the index"));
 
 	repo_init_revisions(the_repository, &rev, prefix);
 	rev.diffopt.context = 7;
@@ -201,15 +201,15 @@ static int edit_patch(int argc, const char **argv, const char *prefix)
 		die(_("editing patch failed"));
 
 	if (stat(file, &st))
-		die_errno(_("Could not stat '%s'"), file);
+		die_errno(_("could not stat '%s'"), file);
 	if (!st.st_size)
-		die(_("Empty patch. Aborted."));
+		die(_("empty patch. aborted"));
 
 	child.git_cmd = 1;
 	strvec_pushl(&child.args, "apply", "--recount", "--cached", file,
 		     NULL);
 	if (run_command(&child))
-		die(_("Could not apply '%s'"), file);
+		die(_("could not apply '%s'"), file);
 
 	unlink(file);
 	free(file);
@@ -567,7 +567,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 finish:
 	if (write_locked_index(&the_index, &lock_file,
 			       COMMIT_LOCK | SKIP_IF_UNCHANGED))
-		die(_("Unable to write new index file"));
+		die(_("unable to write new index file"));
 
 	dir_clear(&dir);
 	clear_pathspec(&pathspec);