Understanding a this._(STRING) call in node RED
<p>I'm trying to understand existing code of the Switch node in node-red to deal with and make my own node correctly.</p>

<p>I'm stuck with these lines :</p>

<pre><code>var operators = [
                {v:"eq",t:"=="},
                {v:"neq",t:"!="},
                {v:"lt",t:"&lt;"},
                {v:"lte",t:"&lt;="},
                {v:"gt",t:"&gt;"},
                {v:"gte",t:"&gt;="},
                {v:"btwn",t:this._("switch.rules.btwn")},
                {v:"cont",t:this._("switch.rules.cont")},
                {v:"regex",t:this._("switch.rules.regex")},
                {v:"true",t:this._("switch.rules.true")},
                {v:"false",t:this._("switch.rules.false")},
                {v:"null",t:this._("switch.rules.null")},
                {v:"nnull",t:this._("switch.rules.nnull")},
                {v:"else",t:this._("switch.rules.else")}
            ];
</code></pre>

<p>Especially with the <code>this._("switch.rules.smthg")</code>. How it will work ? Sometime in the code, i will see this call, but i'm not able to find where is it stored, and so make my own, like <code>this._(myawesomenode.myawesomesection.myawesomepropertie)</code></p>

<h1>EDIT</h1>

<p>Thanks to your comments, i've seen it's for internationalisation.</p>

<p>Suppposing i have this catalog :</p>

<pre><code>{
    "and": {
        "list": {
            "key": "THE DATA I WANT"
        }    
    }
}
</code></pre>

<p>How can i have my data ? I've tried something like <code>this._(and.list.key)</code> without result.</p>