Hello
You need to create a wpml-config.xml file like explain here
http://polylang.wordpress.com/documentation/documentation-for-developers/the-wpml-language-configuration-file/
You need just the 'admin_texts' part. In Onetone Options > tab Home Page you have 6 sections. Each section has 6 items that can be translate. I give you an example for the Section 1 and Section 2:
<wpml-config>
<admin-texts>
<key name="onetone">
<key name="menu_title_0"/>
<key name="menu_title_1"/>
<key name="section_background_0"/>
<key name="section_background_1"/>
<key name="section_background_video_0"/>
<key name="section_background_video_1"/>
<key name="section_css_class_0"/>
<key name="section_css_class_1"/>
<key name="section_content_0"/>
<key name="section_content_1"/>
<key name="menu_slug_0"/>
<key name="menu_slug_1"/>
</key>
</admin-texts>
</wpml-config>
You should put your file in /wp-content/polylang/ (create the folder if it does not exist). Like this your file won't be crash at the next update.
I didn't test, but it should work.