sync styleguide changes

main/static/main/main.css

main/static/main/main.js

main/templates/main/includes/atoms/buttons/round_button.html

...includes/molecules/articles/article_timeline_preview.html

...main/includes/molecules/blocks/icon_title_text_block.html

main/templates/main/includes/molecules/boxes/card_box.html

.../main/includes/molecules/boxes/image_with_button_box.html

...s/main/includes/molecules/contact/contact_footer_box.html

...es/main/includes/organisms/articles/articles_section.html

...ncludes/organisms/articles/europarl_articles_section.html

...mplates/main/includes/organisms/header/people_header.html

...emplates/main/includes/organisms/header/photo_header.html

...cludes/organisms/header/simple_header_with_ui_switch.html

...ludes/organisms/main_section/representatives_section.html

main/templates/main/main_contact_page.html

main/templates/main/main_person_page.html