Fix i18n

Author: cnasikas

x-pack/.i18nrc.json

@@ -9,6 +9,7 @@
     "xpack.apm": "plugins/apm",
     "xpack.beatsManagement": "plugins/beats_management",
     "xpack.canvas": "plugins/canvas",
+    "xpack.case": "plugins/case",
     "xpack.cloud": "plugins/cloud",
     "xpack.dashboard": "plugins/dashboard_enhanced",
     "xpack.discover": "plugins/discover_enhanced",