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    <p><em>Note: That's not a direct answer for your problem, just suggestion for other approach</em></p> <p>You don't need to use Play's controllers at all instead you can use pure JS files placed in public assets. Let's say that you have 2 languages, one of them is default (let's assume that's English) in such case all you need to is just declare a object with translated labels and some getter ie:</p> <p><strong>/public/i18n/messages.js</strong></p> <pre><code>var messages_default = { 'save': 'Save', 'delete': 'Delete', 'warning': 'You can\'t do that' } function jsMessage(key) { var translated = messages[key]; if (typeof translated === "undefined") { translated = messages_default[key]; if (typeof translated === "undefined") { translated = key; } } return translated; } </code></pre> <p>so you can create a new file for each language and only add translations to it (note: without <code>_default</code> suffix)</p> <p><strong>/public/i18n/messages_de.js</strong> (<em>used Google translator for the 'translations, don't blame me ;)</em>):</p> <pre><code>var messages = { 'save': 'Sparen', 'delete': 'Löschen', 'warning': 'Sie können nicht tun' } </code></pre> <p>in Play's localization file (for non default languages only! <code>conf/messages.de</code> in this case) add a label for path of additional language JS file, ie:</p> <pre><code>add_i18n = i18n/messages_de.js </code></pre> <p>So finally you can include it in German version or skip in default lang with simple condition (remember that for non existing labels Play's <code>Messages</code> returns the key)</p> <pre><code>&lt;script src='@routes.Assets.at("i18n/messages_default.js")'&gt;&lt;/script&gt; @if(Messages("add_i18n") != "add_i18n")){ &lt;script src='@routes.Assets.at(Messages("add_i18n"))'&gt;&lt;/script&gt; } </code></pre> <p>So finally you can use it in JS like:</p> <pre><code>&lt;script&gt; alert( jsMessage('warning') ); &lt;/script&gt; </code></pre>
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    1. COI followed these steps: 1) Created /public/i18n/messages.js and copied the code mentioned by you . 2) Created /public/i18n/messages_de.js and copied the code 3) Created /conf/messages.de file and added the key value pair. 4) wrote add_i18n = i18n/messages_de.js in application.conf file 5) wrote routes.asset code, mentioned by you, in mainpage.scala.html 6) wrote alert(Messages('save')); in main.js. But its not working.Kindly correct me if i am going wrong anywhere.
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    2. COCheck my currnet edit for the last snippet of code (with `jsMessage(key)` )
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    3. COI included the alert message but now its failing on this line var translated = messages[key]; saying messages is not defined
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