diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 81031f0..23a287e 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -125,3 +125,4 @@ Contributors
 - Nando Florestan, 2014/11/27
 - Amos Latteier, 2014/11/30
 - Jimmy Thrasibule, 2014/12/11
+- Tinne Cahy, 2015/12/22
diff --git a/colander/locale/nl/LC_MESSAGES/colander.mo b/colander/locale/nl/LC_MESSAGES/colander.mo
index caf830b..7d90605 100644
Binary files a/colander/locale/nl/LC_MESSAGES/colander.mo and b/colander/locale/nl/LC_MESSAGES/colander.mo differ
diff --git a/colander/locale/nl/LC_MESSAGES/colander.po b/colander/locale/nl/LC_MESSAGES/colander.po
index dc218ca..0152f5c 100644
--- a/colander/locale/nl/LC_MESSAGES/colander.po
+++ b/colander/locale/nl/LC_MESSAGES/colander.po
@@ -7,141 +7,152 @@ msgid ""
 msgstr ""
 "Project-Id-Version: colander 0.8\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2013-05-19 13:15+0200\n"
+"POT-Creation-Date: 2013-11-16 14:23+0900\n"
 "PO-Revision-Date: 2011-06-03 00:22+0200\n"
-"Last-Translator: Wichert Akkerman <wichert@wiggy.net>\n"
+"Last-Translator: Tinne Cahy <cahytinne@gmail.com>\n"
 "Language-Team: nl <LL@li.org>\n"
-"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"Language: \n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=utf-8\n"
+"Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
 "Generated-By: Babel 1.3\n"
 
-#: colander/__init__.py:233
+#: colander/__init__.py:240
 msgid "Invalid value"
 msgstr "Ongeldige waarde"
 
-#: colander/__init__.py:270
+#: colander/__init__.py:283
 msgid "String does not match expected pattern"
 msgstr "Tekst is niet in het juiste formaat"
 
-#: colander/__init__.py:287
+#: colander/__init__.py:302
 msgid "Invalid email address"
 msgstr "Ongeldig e-mail adres"
 
-#: colander/__init__.py:315
+#: colander/__init__.py:330
 msgid "${val} is less than minimum value ${min}"
 msgstr "${val} is minder dan de minimum waarde ${min}"
 
-#: colander/__init__.py:316
+#: colander/__init__.py:331
 msgid "${val} is greater than maximum value ${max}"
-msgstr "${val} is groter dan de maximale toegestaane waarde ${max}"
+msgstr "${val} is groter dan de maximale toegestane waarde ${max}"
 
-#: colander/__init__.py:348
+#: colander/__init__.py:363
 msgid "Shorter than minimum length ${min}"
 msgstr "De minimale lengte is ${min}"
 
-#: colander/__init__.py:354
+#: colander/__init__.py:369
 msgid "Longer than maximum length ${max}"
 msgstr "De maximale lengte is ${max}"
 
-#: colander/__init__.py:367
+#: colander/__init__.py:382
 msgid "\"${val}\" is not one of ${choices}"
-msgstr "\"${val}\" is geen toegestaande waarde. Kies één van ${choices}."
+msgstr "\"${val}\" is geen toegestane waarde. Kies één van ${choices}."
 
-#: colander/__init__.py:377
+#: colander/__init__.py:392
 msgid "One or more of the choices you made was not acceptable"
-msgstr ""
+msgstr "Één of meer van de keuzes die je maakte zijn niet aanvaardbaar"
 
-#: colander/__init__.py:423
+#: colander/__init__.py:414 colander/__init__.py:419
+#, fuzzy
+msgid "\"${val}\" is not a valid credit card number"
+msgstr "\"${val}\" is geen geldige kredietkaartnummer"
+
+#: colander/__init__.py:440
 msgid "Must be a URL"
-msgstr ""
+msgstr "Moet een URL zijn"
 
-#: colander/__init__.py:519
+#: colander/__init__.py:536
 msgid "\"${val}\" is not a mapping type: ${err}"
-msgstr "\"${val}\" is geen map type: ${err}"
+msgstr "\"${val}\" is geen mapping type: ${err}"
 
-#: colander/__init__.py:560
+#: colander/__init__.py:578
 msgid "Unrecognized keys in mapping: \"${val}\""
-msgstr "Onbekende waardes in map: \"${val}\""
+msgstr "Onbekende waardes in mapping: \"${val}\""
 
-#: colander/__init__.py:656 colander/__init__.py:856
+#: colander/__init__.py:674 colander/__init__.py:905
 msgid "\"${val}\" is not iterable"
 msgstr "\"${val}\" is niet itereerbaar"
 
-#: colander/__init__.py:664
+#: colander/__init__.py:682
 msgid ""
-"\"${val}\" has an incorrect number of elements (expected ${exp}, was "
-"${was})"
+"\"${val}\" has an incorrect number of elements (expected ${exp}, was ${was})"
 msgstr ""
-"\"${val}\" bevat niet het juiste aantal element (${was} in plaats van "
-"${exp})"
+"\"${val}\" bevat niet het juiste aantal elementen (${was} in plaats van ${exp})"
 
-#: colander/__init__.py:803
+#: colander/__init__.py:821 colander/__init__.py:852
 msgid "${cstruct} is not iterable"
 msgstr "${cstruct} is niet itereerbaar"
 
-#: colander/__init__.py:1075
+#: colander/__init__.py:1124
 msgid "${val} cannot be serialized: ${err}"
 msgstr "${val} kan niet worden opgeslagen: ${err}"
 
-#: colander/__init__.py:1093
+#: colander/__init__.py:1142
 msgid "${val} is not a string: ${err}"
 msgstr "${val} is geen tekst: ${err}"
 
-#: colander/__init__.py:1113 colander/__init__.py:1124
+#: colander/__init__.py:1162 colander/__init__.py:1173
 msgid "\"${val}\" is not a number"
 msgstr "\"${val}\" is geen getal"
 
-#: colander/__init__.py:1268
+#: colander/__init__.py:1317
 msgid "${val} is not a string"
 msgstr "${val} is geen tekst"
 
-#: colander/__init__.py:1279
+#: colander/__init__.py:1328
 msgid "\"${val}\" is neither in (${false_choices}) nor in (${true_choices})"
-msgstr ""
+msgstr "\"${val}\" is niet aanwezig in (${false_choices}) noch aanwezig in (${true_choices})"
 
-#: colander/__init__.py:1339 colander/__init__.py:1356
-#: colander/__init__.py:1366
+#: colander/__init__.py:1388 colander/__init__.py:1405
+#: colander/__init__.py:1415
 msgid "relative name \"${val}\" irresolveable without package"
 msgstr "relatieve aanduiding \"${val}\" kan niet worden opgezocht zonder package"
 
-#: colander/__init__.py:1396
+#: colander/__init__.py:1445
 msgid "\"${val}\" has no __name__"
 msgstr "\"${val}\" heeft geen __name__"
 
-#: colander/__init__.py:1405
+#: colander/__init__.py:1454
 msgid "\"${val}\" is not a string"
 msgstr "\"${val}\" is geen tekst"
 
-#: colander/__init__.py:1414
+#: colander/__init__.py:1463
 msgid "The dotted name \"${name}\" cannot be imported"
 msgstr "Kan \"${name}\" niet importeren"
 
-#: colander/__init__.py:1462 colander/__init__.py:1538
+#: colander/__init__.py:1511 colander/__init__.py:1587
 msgid "Invalid date"
 msgstr "Geen geldige datum"
 
-#: colander/__init__.py:1478
+#: colander/__init__.py:1527
 msgid "\"${val}\" is not a datetime object"
 msgstr "\"${val}\" is geen datetime object"
 
-#: colander/__init__.py:1549
+#: colander/__init__.py:1598
 msgid "\"${val}\" is not a date object"
 msgstr "\"${val}\" is geen date object"
 
-#: colander/__init__.py:1610
+#: colander/__init__.py:1659
 #, fuzzy
-#| msgid "Invalid date"
 msgid "Invalid time"
 msgstr "Geen geldige datum"
 
-#: colander/__init__.py:1621
+#: colander/__init__.py:1670
 #, fuzzy
-#| msgid "\"${val}\" is not a datetime object"
 msgid "\"${val}\" is not a time object"
 msgstr "\"${val}\" is geen datetime object"
 
-#: colander/__init__.py:1878 colander/__init__.py:1880
+#: colander/__init__.py:1795
 msgid "Required"
 msgstr "Verplicht"
+
+#: colander/tests/test_colander.py:295 colander/tests/test_colander.py:302
+msgid "fail ${val}"
+msgstr "faal ${val}"
+
+#: colander/tests/test_colander.py:469
+#, fuzzy
+msgid "${val}: ${choices}"
+msgstr "\"${val}\" is geen toegestane waarde. Kies één van ${choices}."