Multilanguage plugin

[dackoni]

Hi, I am trying to make this plugin to be multilanguage (client side). (using WHMCS 7.5.1) I made tpl files (start.tpl, shutdown.tpl, restore.tpl, reboot.tpl, ipmanagement.tpl, history.tpl, firewall.tpl, blocksotage.tpl, buckups.tpl) multilanguage using {$LANG.something} tags .Everything works fine. But in tpl files (clientarea.tpl, subviews/bandwidth.tpl, subwievs/clientarea.tpl, subviews/history.tpl, subviews/load.tpl) when I use any smarty, like {$LANG.vps.info.domain} insted of "Domain"
example:

<tr>
            <td style="width: 50%">{$LANG.vps.info.domain}</td>
            <td>{$details.domain}</td>
</tr> 

insted of

<tr>
            <td style="width: 50%">Domain</td>
            <td>{$details.domain}</td>
</tr> 

I get empty tags.

<tr>
            <td style="width: 50%"></td>
            <td>centos7.somedomain.com</td>
</tr>

Also, how to make sidebar link multilanguage without changging php code.

Any help, it is very important to my project. Thank you in advance. Danijel Trifunović