Hi,

To fix this problem, you need to open your SVG logo file with some editor like Sublime Text or default system text editor and add height and width attributes to your <svg> tag like it is shown on the screenshot https://gyazo.com/83fd36b0bb9628bb1aed2bd3d5d063c5
Then, you will need to re-upload your icons in the WordPress Dashboard.

As for the language switcher shortcode, it does not seem to be a theme problem. If you have a conflict between WPML and your plugins, you must consult the plugin developers for help.

Regards