You can modify the Login.dtl file found here:
\OTRS\OTRS\Kernel\Output\HTML\Standard
Just comment out the entire block of code as seen below:
Good luck!
# --
# language
# --
<!--
<p>
<form action="$Env{"CGIHandle"}" method="post"
enctype="application/x-www-form-urlencoded">
<input type="hidden" name="Action" value=""/>
<input type="hidden" name="RequestedURL" value="$QData{"RequestedURL"}"/>
<table border="0" cellspacing="0" cellpadding="3" width="280">
<tr>
<td align="center" class="singleboxhead">$Text{"Language"}</td>
</tr>
<tr>
<td align="center" class="singleboxbody">
<table cellspacing="8" cellpadding="2">
<tr>
<td class="singleboxkey">$Text{"Language"}:</td>
<td class="singleboxvalue">$Data{"Language"}</td>
</tr>
</table>
<input class="button" type="submit" value="$Text{"Submit"}"/>
</td>
</tr>
</table>
</form>
</p>
-->
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