This is an example of the beginning of content of modules\boonex\russian\data\langs\bx_accounts\ru.xml:

<string name="_bx_accnt"><![CDATA[Аккаунты]]></string>

<string name="_bx_accounts"><![CDATA[Аккаунты]]></string>

The bold text means the keys which should be "found", the crossed words mean the text which should be translated.