Correctly render the "read more" and article navigation links (see #7300)
Always pass a DC object in the `toggleVisibility` callback (see #7314)
Update the language files
Bump the version number
Merge branch 'hotfix/3.2.15' into hotfix/3.3.6

Conflicts:
	system/bin/txpurge
	system/config/constants.php
	system/docs/CHANGELOG.md
	system/modules/calendar/languages/sl/default.xlf
	system/modules/core/languages/es/tl_content.xlf
	system/modules/core/languages/fr/default.xlf
	system/modules/core/languages/fr/explain.xlf
	system/modules/core/languages/fr/tl_form_field.xlf
	system/modules/core/languages/fr/tl_page.xlf
	system/modules/core/languages/ja/tl_content.xlf
	system/modules/core/languages/ja/tl_module.xlf
	system/modules/core/languages/ja/tl_style.xlf
	system/modules/core/languages/my/default.xlf
	system/modules/core/languages/my/exception.xlf
	system/modules/core/languages/my/tl_content.xlf
	system/modules/core/languages/my/tl_files.xlf
	system/modules/core/languages/my/tl_form.xlf
	system/modules/core/languages/my/tl_form_field.xlf
	system/modules/core/languages/my/tl_install.xlf
	system/modules/core/languages/my/tl_settings.xlf
	system/modules/core/languages/my/tl_user.xlf
	system/modules/core/languages/ru/tl_files.xlf
	system/modules/core/languages/sk/tl_page.xlf
	system/modules/core/languages/sl/modules.xlf
	system/modules/core/languages/sl/tl_files.xlf
	system/modules/core/modules/ModuleArticle.php
	system/modules/core/modules/ModuleArticlenav.php