translation.naml

<translation>
    <from>Next Topic</from>
    <to>
        <n.if.equal value1="[n.page_node.get_app_node.type/]" value2='gallery'>
            <then>Next Image</then>
            <else>Next Topic</else>
        </n.if.equal>
    </to>
</translation>

<translation>
    <from>Previous Topic</from>
    <to>
        <n.if.equal value1="[n.page_node.get_app_node.type/]" value2='gallery'>
            <then>Previous Image</then>
            <else>Previous Topic</else>
        </n.if.equal>
    </to>
</translation>