test-i18n: make test conditional on msgfmt availability

tests/hghave

@@ -108,6 +108,9 b' def has_lsprof():'
     except ImportError:
         return False
 
+def has_gettext():
+    return matchoutput('msgfmt --version', 'GNU gettext-tools')
+
 def has_git():
     return matchoutput('git --version 2>&1', r'^git version')
 
@@ -189,6 +192,7 b' checks = {'
     "eol-in-paths": (has_eol_in_paths, "end-of-lines in paths"),
     "execbit": (has_executablebit, "executable bit"),
     "fifo": (has_fifo, "named pipes"),
+    "gettext": (has_gettext, "GNU Gettext (msgfmt)"),
     "git": (has_git, "git command line client"),
     "gpg": (has_gpg, "gpg client"),
     "icasefs": (has_icasefs, "case insensitive file system"),

tests/test-i18n.t

@@ -1,3 +1,7 b''
+Translations are optional:
+
+  $ "$TESTDIR/hghave" gettext || exit 80
+
 Test that translations are compiled and installed correctly.
 
 Default encoding in tests is "ascii" and the translation is encoded