Add Japanese translations for random node (#658)

function/random/locales/en-US/random.html

@@ -0,0 +1,7 @@
+<script type="text/html" data-help-name="random">
+    <p>Generates a random number between a low and high value.</p>
+    <p>If set to return an integer it can <i>include</i> both the low and high values.
+    <code>min <= n <= max</code></p>
+    <p>If set to return a floating point value it will be from the low value, up to, but
+    not including the high value. <code>min <= n < max</code></p>
+</script>

function/random/locales/en-US/random.json

@@ -0,0 +1,13 @@
+{
+    "random": {
+        "label": {
+            "generate": "Generate",
+            "wholeNumber": "a whole number - integer",
+            "realNumber": "a real number - floating point",
+            "from": "From",
+            "lowestNumber": "lowest number",
+            "to": "To",
+            "highestNumber": "highest number"
+        }
+    }
+}