Hi.,
1) Use slider image of size 1358 x 528 so that it works like our demo. You have used very bigger images.
2) The responsive issues is due to the css styles that you have written in Dashboard > Lost World > Integration > Header Code and Body Code. Just remove that and check it.
3) The titles has been removed.
4) a) You can find the default.po file in the themes folder itself. Get into this path wp-content/themes/alms/languages and you can find the default.po file.
b) If you are running a multi language site, you need to install the wpml plugin.
c) Or if you are running a single language site other than english. Say for example if you are running German site only. Go to wp-config.php and change the language code as define(‘WPLANG’, ‘de_DE’);
d) Then rename the file default.po to de_DE.po and open the file with a poeditor and you can translate all the texts from our theme.
e) Finally you will get the mo file there. Uploading that mo file the site will be fully translated to german.
5) http://boliviadventure.com/wp-content/themes/LostWorld/images/logo_footer.png