diff --git a/cy/typo3/sysext/core/Resources/Private/Language/cy.locallang_mod_site.xlf b/cy/typo3/sysext/core/Resources/Private/Language/cy.locallang_mod_site.xlf
new file mode 100644
index 0000000000000000000000000000000000000000..c094f90ea4cedeaf1fcd6e494f390705ff934e9c
--- /dev/null
+++ b/cy/typo3/sysext/core/Resources/Private/Language/cy.locallang_mod_site.xlf
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" version="1.2">
+  <file source-language="en" datatype="plaintext" original="EXT:core/Resources/Private/Language/locallang_mod_site.xlf" date="2017-12-29T20:22:34Z" product-name="core" target-language="cy">
+    <header/>
+    <body>
+      <trans-unit id="mlang_labels_tabdescr" resname="mlang_labels_tabdescr" approved="yes">
+        <source>This main module holds all optimization for Site Integrators to manage different websites within one TYPO3 installation, templates, TypoScript and routing options.</source>
+        <target state="final">Mae'r prif fodiwl hwn yn dal yr holl optimeiddio i Integreiddwyr Safle reoli gwahanol wefannau o fewn un gosodiad TYPO3, templedi, TypoScript ac opsiynau llwybro.</target>
+      </trans-unit>
+      <trans-unit id="mlang_tabs_tab" resname="mlang_tabs_tab" approved="yes">
+        <source>Site Management</source>
+        <target state="final">Rheoli Safle</target>
+        <note>Label of TYPO3 backend main menu group "sites"</note>
+      </trans-unit>
+    </body>
+  </file>
+</xliff>