There are a couple other improvements on these strings as well:

 - add missing colon (as separator)
 - quote paths
 - provide more information on error messages
 - keep first word in lowercase
 - some die() become BUG()

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 read-cache.c    | 63 +++++++++++++++++++++++++------------------------
 t/t1450-fsck.sh |  2 +-
 2 files changed, 33 insertions(+), 32 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index d57958233e..5083cd8333 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -316,7 +316,7 @@ static int ce_match_stat_basic(const struct cache_entry 
*ce, struct stat *st)
                        changed |= DATA_CHANGED;
                return changed;
        default:
-               die("internal error: ce_mode is %o", ce->ce_mode);
+               BUG("unsupported ce_mode %o", ce->ce_mode);
        }
 
        changed |= match_stat_data(&ce->ce_stat_data, st);
@@ -672,7 +672,8 @@ static struct cache_entry *create_alias_ce(struct 
index_state *istate,
        struct cache_entry *new_entry;
 
        if (alias->ce_flags & CE_ADDED)
-               die("Will not add file alias '%s' ('%s' already exists in 
index)", ce->name, alias->name);
+               die(_("will not add file alias '%s' ('%s' already exists in 
index)"),
+                   ce->name, alias->name);
 
        /* Ok, create the new entry using the name of the existing alias */
        len = ce_namelen(alias);
@@ -687,7 +688,7 @@ void set_object_name_for_intent_to_add_entry(struct 
cache_entry *ce)
 {
        struct object_id oid;
        if (write_object_file("", 0, blob_type, &oid))
-               die("cannot create an empty blob in the object database");
+               die(_("cannot create an empty blob in the object database"));
        oidcpy(&ce->oid, &oid);
 }
 
@@ -708,7 +709,7 @@ int add_to_index(struct index_state *istate, const char 
*path, struct stat *st,
                newflags |= HASH_RENORMALIZE;
 
        if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode))
-               return error("%s: can only add regular files, symbolic links or 
git-directories", path);
+               return error(_("%s: can only add regular files, symbolic links 
or git-directories"), path);
 
        namelen = strlen(path);
        if (S_ISDIR(st_mode)) {
@@ -763,7 +764,7 @@ int add_to_index(struct index_state *istate, const char 
*path, struct stat *st,
        if (!intent_only) {
                if (index_path(istate, &ce->oid, path, st, newflags)) {
                        discard_cache_entry(ce);
-                       return error("unable to index file %s", path);
+                       return error(_("unable to index file '%s'"), path);
                }
        } else
                set_object_name_for_intent_to_add_entry(ce);
@@ -782,7 +783,7 @@ int add_to_index(struct index_state *istate, const char 
*path, struct stat *st,
                discard_cache_entry(ce);
        else if (add_index_entry(istate, ce, add_option)) {
                discard_cache_entry(ce);
-               return error("unable to add %s to index", path);
+               return error(_("unable to add '%s' to index"), path);
        }
        if (verbose && !was_same)
                printf("add '%s'\n", path);
@@ -793,7 +794,7 @@ int add_file_to_index(struct index_state *istate, const 
char *path, int flags)
 {
        struct stat st;
        if (lstat(path, &st))
-               die_errno("unable to stat '%s'", path);
+               die_errno(_("unable to stat '%s'"), path);
        return add_to_index(istate, path, &st, flags);
 }
 
@@ -818,7 +819,7 @@ struct cache_entry *make_cache_entry(struct index_state 
*istate,
        int len;
 
        if (!verify_path(path, mode)) {
-               error("Invalid path '%s'", path);
+               error(_("invalid path '%s'"), path);
                return NULL;
        }
 
@@ -844,7 +845,7 @@ struct cache_entry *make_transient_cache_entry(unsigned int 
mode, const struct o
        int len;
 
        if (!verify_path(path, mode)) {
-               error("Invalid path '%s'", path);
+               error(_("invalid path '%s'"), path);
                return NULL;
        }
 
@@ -1297,12 +1298,12 @@ static int add_index_entry_with_check(struct 
index_state *istate, struct cache_e
        if (!ok_to_add)
                return -1;
        if (!verify_path(ce->name, ce->ce_mode))
-               return error("Invalid path '%s'", ce->name);
+               return error(_("invalid path '%s'"), ce->name);
 
        if (!skip_df_check &&
            check_file_directory_conflict(istate, ce, pos, ok_to_replace)) {
                if (!ok_to_replace)
-                       return error("'%s' appears as both a file and as a 
directory",
+                       return error(_("'%s' appears as both a file and as a 
directory"),
                                     ce->name);
                pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), 
ce_stage(ce));
                pos = -pos-1;
@@ -1676,10 +1677,10 @@ static int verify_hdr(const struct cache_header *hdr, 
unsigned long size)
        int hdr_version;
 
        if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
-               return error("bad signature");
+               return error(_("bad signature 0x%08x"), hdr->hdr_signature);
        hdr_version = ntohl(hdr->hdr_version);
        if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version)
-               return error("bad index version %d", hdr_version);
+               return error(_("bad index version %d"), hdr_version);
 
        if (!verify_index_checksum)
                return 0;
@@ -1688,7 +1689,7 @@ static int verify_hdr(const struct cache_header *hdr, 
unsigned long size)
        the_hash_algo->update_fn(&c, hdr, size - the_hash_algo->rawsz);
        the_hash_algo->final_fn(hash, &c);
        if (!hasheq(hash, (unsigned char *)hdr + size - the_hash_algo->rawsz))
-               return error("bad index file sha1 signature");
+               return error(_("bad index file sha1 signature"));
        return 0;
 }
 
@@ -1718,9 +1719,9 @@ static int read_index_extension(struct index_state 
*istate,
                break;
        default:
                if (*ext < 'A' || 'Z' < *ext)
-                       return error("index uses %.4s extension, which we do 
not understand",
+                       return error(_("index uses %.4s extension, which we do 
not understand"),
                                     ext);
-               fprintf(stderr, "ignoring %.4s extension\n", ext);
+               fprintf_ln(stderr, _("ignoring %.4s extension"), ext);
                break;
        }
        return 0;
@@ -1767,7 +1768,7 @@ static struct cache_entry *create_from_disk(struct 
mem_pool *ce_mem_pool,
                extended_flags = get_be16(&ondisk2->flags2) << 16;
                /* We do not yet understand any bit out of CE_EXTENDED_FLAGS */
                if (extended_flags & ~CE_EXTENDED_FLAGS)
-                       die("Unknown index entry format %08x", extended_flags);
+                       die(_("unknown index entry format 0x%08x"), 
extended_flags);
                flags |= extended_flags;
                name = ondisk2->name;
        }
@@ -1840,13 +1841,13 @@ static void check_ce_order(struct index_state *istate)
                int name_compare = strcmp(ce->name, next_ce->name);
 
                if (0 < name_compare)
-                       die("unordered stage entries in index");
+                       die(_("unordered stage entries in index"));
                if (!name_compare) {
                        if (!ce_stage(ce))
-                               die("multiple stage entries for merged file 
'%s'",
+                               die(_("multiple stage entries for merged file 
'%s'"),
                                    ce->name);
                        if (ce_stage(ce) > ce_stage(next_ce))
-                               die("unordered stage entries for '%s'",
+                               die(_("unordered stage entries for '%s'"),
                                    ce->name);
                }
        }
@@ -2149,19 +2150,19 @@ int do_read_index(struct index_state *istate, const 
char *path, int must_exist)
        if (fd < 0) {
                if (!must_exist && errno == ENOENT)
                        return 0;
-               die_errno("%s: index file open failed", path);
+               die_errno(_("%s: index file open failed"), path);
        }
 
        if (fstat(fd, &st))
-               die_errno("cannot stat the open index");
+               die_errno(_("%s: cannot stat the open index"), path);
 
        mmap_size = xsize_t(st.st_size);
        if (mmap_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
-               die("index file smaller than expected");
+               die(_("%s: index file smaller than expected"), path);
 
        mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
        if (mmap == MAP_FAILED)
-               die_errno("unable to map index file");
+               die_errno(_("%s: unable to map index file"), path);
        close(fd);
 
        hdr = (const struct cache_header *)mmap;
@@ -2243,7 +2244,7 @@ int do_read_index(struct index_state *istate, const char 
*path, int must_exist)
 
 unmap:
        munmap((void *)mmap, mmap_size);
-       die("index file corrupt");
+       die(_("index file corrupt"));
 }
 
 /*
@@ -2255,7 +2256,7 @@ int do_read_index(struct index_state *istate, const char 
*path, int must_exist)
 static void freshen_shared_index(const char *shared_index, int warn)
 {
        if (!check_and_freshen_file(shared_index, 1) && warn)
-               warning("could not freshen shared index '%s'", shared_index);
+               warning(_("could not freshen shared index '%s'"), shared_index);
 }
 
 int read_index_from(struct index_state *istate, const char *path,
@@ -2290,7 +2291,7 @@ int read_index_from(struct index_state *istate, const 
char *path,
        base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_oid_hex);
        ret = do_read_index(split_index->base, base_path, 1);
        if (!oideq(&split_index->base_oid, &split_index->base->oid))
-               die("broken index, expect %s in %s, got %s",
+               die(_("broken index, expect %s in %s, got %s"),
                    base_oid_hex, base_path,
                    oid_to_hex(&split_index->base->oid));
 
@@ -2356,14 +2357,14 @@ void validate_cache_entries(const struct index_state 
*istate)
 
        for (i = 0; i < istate->cache_nr; i++) {
                if (!istate) {
-                       die("internal error: cache entry is not allocated from 
expected memory pool");
+                       BUG("cache entry is not allocated from expected memory 
pool");
                } else if (!istate->ce_mem_pool ||
                        !mem_pool_contains(istate->ce_mem_pool, 
istate->cache[i])) {
                        if (!istate->split_index ||
                                !istate->split_index->base ||
                                !istate->split_index->base->ce_mem_pool ||
                                
!mem_pool_contains(istate->split_index->base->ce_mem_pool, istate->cache[i])) {
-                               die("internal error: cache entry is not 
allocated from expected memory pool");
+                               BUG("cache entry is not allocated from expected 
memory pool");
                        }
                }
        }
@@ -3076,7 +3077,7 @@ static int write_shared_index(struct index_state *istate,
                return ret;
        ret = adjust_shared_perm(get_tempfile_path(*temp));
        if (ret) {
-               error("cannot fix permission bits on %s", 
get_tempfile_path(*temp));
+               error(_("cannot fix permission bits on '%s'"), 
get_tempfile_path(*temp));
                return ret;
        }
        ret = rename_tempfile(temp,
@@ -3222,7 +3223,7 @@ int read_index_unmerged(struct index_state *istate)
                new_ce->ce_namelen = len;
                new_ce->ce_mode = ce->ce_mode;
                if (add_index_entry(istate, new_ce, ADD_CACHE_SKIP_DFCHECK))
-                       return error("%s: cannot drop to stage #0",
+                       return error(_("%s: cannot drop to stage #0"),
                                     new_ce->name);
        }
        return unmerged;
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index 0f2dd26f74..90c765df3a 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -754,7 +754,7 @@ test_expect_success 'detect corrupt index file in fsck' '
        test_when_finished "mv .git/index.backup .git/index" &&
        corrupt_index_checksum &&
        test_must_fail git fsck --cache 2>errors &&
-       grep "bad index file" errors
+       test_i18ngrep "bad index file" errors
 '
 
 test_done
-- 
2.19.1.647.g708186aaf9

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