Make testing i18n the default.

tools/run-tests.py

Index: tools/run-tests.py
diff --git a/tools/run-tests.py b/tools/run-tests.py
index 48682d4444e586c8b48b1c146898b0dc17468ba8..d023cf1fbaaacab83806a0bdf2b8177e48fe9ef1 100755
--- a/tools/run-tests.py
+++ b/tools/run-tests.py
@@ -112,6 +112,9 @@ def BuildOptions():
   result.add_option("-m", "--mode",
                     help="The test modes in which to run (comma-separated)",
                     default="release,debug")
+  result.add_option("--no-i18n", "--noi18n",
+                    help="Skip internationalization tests",
+                    default=False, action="store_true")
   result.add_option("--no-network", "--nonetwork",
                     help="Don't distribute tests on the network",
                     default=(utils.GuessOS() != "linux"),
@@ -210,6 +213,8 @@ def ProcessOptions(options):
   if not options.flaky_tests in ["run", "skip", "dontcare"]:
     print "Unknown flaky test mode %s" % options.flaky_tests
     return False
+  if not options.no_i18n:
+    DEFAULT_TESTS.append("intl")
   return True