add i18n

messages/en-US/memorize/choose.json

@@ -0,0 +1,4 @@
+{
+  "back": "Back",
+  "choose": "Choose"
+}

messages/en-US/memorize/edit.json

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+{
+  "back": "Back",
+  "save": "Save Word Pairs",
+  "locale1": "Locale 1",
+  "locale2": "Locale 2"
+}

messages/en-US/memorize/main.json

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+{
+  "title": "Memorize",
+  "locale1": "Your selected locale 1 is {locale}",
+  "locale2": "Your selected locale 2 is {locale}",
+  "total": "There are {total} word pairs in total",
+  "start": "Start",
+  "import": "Import",
+  "save": "Save",
+  "edit": "Edit"
+}

messages/en-US/memorize/start.json

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+{
+  "show": "Show",
+  "reverse": "Reverse",
+  "dictation": "Dictation",
+  "back": "Back",
+  "next": "Next"
+}