Add RTL Text direction for e.g. Arabic language support in CKEditor for TYPO3

TYPO3-ckeditor-arabic-rtl-direction

# 1
# ---------------------------------------------
# 
# Add tsconfig to load the custom RTE config:
`RTE.default.preset = Custom`


# 2
# ---------------------------------------------
#
# Add the yaml config
# EXT:{template}/Configuration/RTE/Custom.yaml
# 
# the essential part for the RTL direction:
# 
#  "bidi"
#   editor.toolbarGroups
#      { name: paragraph, groups: [list, indent, blocks, align, bidi] }
# 
#
#   editor.toolbarGroups.extraPlugins
#      - bidi
imports:
  - { resource: "EXT:rte_ckeditor/Configuration/RTE/Processing.yaml" }
  - { resource: "EXT:rte_ckeditor/Configuration/RTE/Editor/Base.yaml" }
  - { resource: "EXT:rte_ckeditor/Configuration/RTE/Editor/Plugins.yaml" }

editor:
  config:
    format_tags: "p;h1;h2;h3;h4;h5;pre"

    toolbarGroups:
      - { name: styles, groups: [styles, format] }
      - { name: basicstyles, groups: [basicstyles] }
      - { name: paragraph, groups: [list, indent, blocks, align, bidi] }
      - { name: links, groups: [links] }
      - { name: clipboard, groups: [clipboard, cleanup, undo] }
      - { name: editing, groups: [spellchecker] }
      - { name: insert, groups: [insert] }
      - { name: tools, groups: [table, specialchar, insertcharacters] }
      - { name: document, groups: [mode] }

    justifyClasses:
      - text-left
      - text-center
      - text-right
      - text-justify

    extraPlugins:
      - justify
      - bidi

    removePlugins:
      - image

    removeButtons:
      - Anchor
      - Underline
      - Strike
      - Styles

# 3
# ---------------------------------------------
# Load the Custom config
# EXT:{template}/ext_localconf.php
$GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['Custom'] = 'EXT:{template}/Configuration/RTE/Custom.yaml';


# 4
# ---------------------------------------------
# Clear TYPO3 cache and reload the backend