Multiple bug fixes

【Contents of the fix】
■Added mobile support for the “Link Menu (for switching foreign language sites)”.
■Added icon presets to “Link Menu (for switching foreign language sites)”.
■Adjusted the style of the search widget.
■Updated the page builder to support Gutenberg (WP5.2.x).
■Fixed the date display format.
■Added SSL support.
■Fixed a bug that the radio button selection disappears when dragging the repeater field in the theme options.
■Fixed a bug that certain English words entered in the theme options were translated without permission.
■Remove quick tags that are not actually implemented.

The following are the files that have been modified for this update.
【Fixed files】
admin/css/my_admin.css
admin/inc/basic.php
admin/inc/blog.php
admin/inc/front_page.php
admin/js/my_script.js
admin/theme-options.php
css/responsive.css
fonts/design_plus.eot
fonts/design_plus.svg
fonts/design_plus.ttf
fonts/design_plus.woff
functions/custom_editor.php
functions/head.php
js/jscript.js
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/admin/js/editor.js
pagebuilder/assets/admin/js/googlemap.js
pagebuilder/assets/admin/js/repeater.js
pagebuilder/assets/admin/js/tab.js
pagebuilder/assets/css/googlemap.css
pagebuilder/assets/css/pagebuilder.css
pagebuilder/assets/css/slider.css
pagebuilder/assets/css/tab.css
pagebuilder/modules/catchcopy.php
pagebuilder/modules/editor.php
pagebuilder/modules/googlemap.php
pagebuilder/modules/headline.php
pagebuilder/modules/image.php
pagebuilder/modules/includes/slick.php
pagebuilder/modules/includes/theme_options.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
widget/google_search.php
widget/news_list.php
widget/styled_post_list1.php
widget/styled_post_list3.php
widget/tab_post_list.php
archive-news.php
archive.php
front-page.php
functions.php
header.php
index.php
single-cpt.php
single-news.php
single.php
style.css
taxonomy.php

【Added files】
admin/img/cn.png
admin/img/de.png
admin/img/es.png
admin/img/fr.png
admin/img/jp.png
admin/img/kr.png
admin/img/pt.png
admin/img/ru.png
admin/img/uk.png
admin/img/us.png
pagebuilder/assets/admin/js/simple_table.js
pagebuilder/assets/admin/js/slider.js
pagebuilder/assets/css/simple_table.css
pagebuilder/assets/js/googlemap.js
pagebuilder/modules/simple_table.php