i18n: standardise messages

Standardise messages in order to save translators some work.

Nuances fixed in this commit:
"failed to read %s"
"read of %s failed"

"detach the HEAD at named commit"
"detach HEAD at named commit"

"removing '%s' failed"
"failed to remove '%s'"

"index file corrupt"
"corrupt index file"

"failed to read %s"
"read of %s failed"

"detach the HEAD at named commit"
"detach HEAD at named commit"

Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 3398c61..05c7b71 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -276,7 +276,7 @@
 
 	hold_locked_index(lock_file, 1);
 	if (read_cache_preload(&opts->pathspec) < 0)
-		return error(_("corrupt index file"));
+		return error(_("index file corrupt"));
 
 	if (opts->source_tree)
 		read_tree_some(opts->source_tree, &opts->pathspec);
@@ -470,7 +470,7 @@
 
 	hold_locked_index(lock_file, 1);
 	if (read_cache_preload(NULL) < 0)
-		return error(_("corrupt index file"));
+		return error(_("index file corrupt"));
 
 	resolve_undo_clear();
 	if (opts->force) {
@@ -1138,7 +1138,7 @@
 		OPT_STRING('B', NULL, &opts.new_branch_force, N_("branch"),
 			   N_("create/reset and checkout a branch")),
 		OPT_BOOL('l', NULL, &opts.new_branch_log, N_("create reflog for new branch")),
-		OPT_BOOL(0, "detach", &opts.force_detach, N_("detach the HEAD at named commit")),
+		OPT_BOOL(0, "detach", &opts.force_detach, N_("detach HEAD at named commit")),
 		OPT_SET_INT('t', "track",  &opts.track, N_("set upstream info for new branch"),
 			BRANCH_TRACK_EXPLICIT),
 		OPT_STRING(0, "orphan", &opts.new_orphan_branch, N_("new-branch"), N_("new unparented branch")),