Fixed multiple bugs / WP5.1.1 compatible

【Contents of the fix】
■Added support for WordPress 5.1.1 (Gutenberg).
■Fixed a bug that the global menu may not be displayed when the browser window width is changed.
■【IE】Fixed a bug that caused the footer “Company Information Settings” to overflow the column width when long text was entered.

The following are the files that have been modified for this update.
【Corrected files】
assets/fonts/design_plus.eot
assets/fonts/design_plus.svg
assets/fonts/design_plus.ttf
assets/fonts/design_plus.woff
assets/js/functions.js
assets/js/functions.min.js
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/admin/js/googlemap.js
pagebuilder/assets/css/googlemap.css
pagebuilder/assets/css/pagebuilder.css
pagebuilder/assets/css/simple_table.css
pagebuilder/assets/css/slider.css
pagebuilder/assets/js/googlemap.js
pagebuilder/modules/catchcopy.php
pagebuilder/modules/googlemap.php
pagebuilder/modules/headline.php
pagebuilder/modules/image.php
pagebuilder/modules/includes/slick.php
pagebuilder/modules/simple_table.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
style.css