Add Japanese translations for random node (#658)

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

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+<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

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+{
+    "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"
+        }
+    }
+}

function/random/locales/ja/random.html

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+<script type="text/html" data-help-name="random">
+    <p>最小値と最大値との間の乱数を生成します。</p>
+    <p>整数値を返すように設定した場合は、乱数には最大値と最小値の両方が<i>含まれます</i>。
+    <code>min <= n <= max</code></p>
+    <p>浮動小数点値を返すように設定した場合、乱数は最小値から最大値未満の値を含み、最大値は含まれません。
+    <code>min <= n < max</code></p>
+</script>

function/random/locales/ja/random.json

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+{
+    "random": {
+        "label": {
+            "generate": "生成",
+            "wholeNumber": "整数 - 整数値",
+            "realNumber": "実数 - 浮動小数点",
+            "from": "最小",
+            "lowestNumber": "最小値",
+            "to": "最大",
+            "highestNumber": "最大値"
+        }
+    }
+}