Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/language/config/install/language.entity.en.yml

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+id: en
+label: English
+direction: 'ltr'
+weight: 0
+locked: false
+status: true
+langcode: en

core/modules/language/config/install/language.entity.und.yml

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+id: und
+label: 'Not specified'
+direction: 'ltr'
+weight: 1
+locked: true
+status: true
+langcode: en

core/modules/language/config/install/language.entity.zxx.yml

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+id: zxx
+label: 'Not applicable'
+direction: 'ltr'
+weight: 2
+locked: true
+status: true
+langcode: en

core/modules/language/config/install/language.mappings.yml

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+# Browsers use different language codes to refer to the same languages,
+# these defaults handles the most common cases.
+map:
+  no: 'nb' # Norwegian
+  pt: 'pt-pt' # Portuguese
+  zh: 'zh-hans' # Default Chinese to simplified script
+  zh-tw: 'zh-hant' # Taiwan Chinese in traditional script
+  zh-hk: 'zh-hant' # Hong Kong Chinese in traditional script
+  zh-mo: 'zh-hant' # Macao Chinese in traditional script
+  zh-cht: 'zh-hant' # traditional Chinese
+  zh-cn: 'zh-hans' # PRC Mainland Chinese in simplified script
+  zh-sg: 'zh-hans' # Singapore Chinese in simplified script
+  zh-chs: 'zh-hans' # simplified Chinese

core/modules/language/config/install/language.negotiation.yml

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+session:
+  parameter: language
+url:
+  source: path_prefix
+  prefixes:
+    en: ''
+  domains:
+    en: ''
+selected_langcode: site_default

core/modules/language/config/install/language.types.yml

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+all:
+  - language_interface
+  - language_content
+  - language_url
+configurable:
+  - language_interface
+negotiation:
+  language_content:
+    enabled:
+      language-interface: 0
+  language_url:
+    enabled:
+      language-url: 0
+      language-url-fallback: 1
+  language_interface:
+    enabled:
+      language-url: 0

core/modules/language/config/optional/tour.tour.language-add.yml

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+id: language-add
+module: language
+label: 'Adding languages'
+langcode: en
+routes:
+  - route_name: language.add
+tips:
+  language-add-overview:
+    id: language-add-overview
+    plugin: text
+    label: 'Adding languages'
+    body: '<p>This page provides the ability to add common languages to your site.</p><p>If the desired language is not available, you can add a custom language.</p>'
+    weight: 1
+  language-add-choose:
+    id: language-add-choose
+    plugin: text
+    label: 'Select language'
+    body: '<p>Choose a language from the list, or choose "Custom language..." at the end of the list.</p><p>Click the "Add language" button when you are done choosing your language.</p><p>When adding a custom language, you will get an additional form where you can provide the name, code, and direction of the language.</p>'
+    weight: 2
+    attributes:
+      data-id: edit-predefined-langcode
+  language-add-continue:
+    id: language-add-continue
+    plugin: text
+    label: 'Continuing on'
+    body: '<p>Now that you have an overview of the "Add languages" feature, you can continue by:<ul><li>Adding a language</li><li>Adding a custom language</li><li><a href="[site:url]/admin/config/regional/language">Viewing configured languages</a></li></ul></p>'
+    weight: 3

core/modules/language/config/optional/tour.tour.language-edit.yml

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+id: language-edit
+module: language
+label: Editing languages
+langcode: en
+routes:
+  - route_name: entity.configurable_language.edit_form
+tips:
+  language-edit-overview:
+    id: language-edit-overview
+    plugin: text
+    label: 'Editing languages'
+    body: '<p>This page provides the ability to edit a language on your site, including custom languages.</p>'
+    weight: 1
+  language-edit-langcode:
+    id: language-edit-langcode
+    plugin: text
+    label: 'Language code'
+    body: '<p>You cannot change the code of a language on the site, since it is used by the system to keep track of the language.</p>'
+    weight: 2
+    attributes:
+      data-id: edit-langcode-view
+  language-edit-label:
+    id: language-edit-label
+    plugin: text
+    label: 'Language name'
+    body: '<p>The language name is used throughout the site for all users and is written in English. Names of built-in languages can be translated using the Interface Translation module, and names of both built-in and custom languages can be translated using the Configuration Translation module.</p>'
+    weight: 3
+    attributes:
+      data-id: edit-label
+  language-edit-direction:
+    id: language-edit-direction
+    plugin: text
+    label: 'Language direction'
+    body: '<p>Choose if the language is a "Left to right" or "Right to left" language.</p><p>Note that not all themes support "Right to left" layouts, so test your theme if you are using "Right to left".</p>'
+    weight: 4
+    attributes:
+      data-id: edit-direction--wrapper--description
+  language-edit-continue:
+    id: language-edit-continue
+    plugin: text
+    label: 'Continuing on'
+    body: '<p>Now that you have an overview of the "Edit language" feature, you can continue by:<ul><li>Editing a language</li><li><a href="[site:url]/admin/config/regional/language">Viewing configured languages</a></li></ul></p>'
+    weight: 5

core/modules/language/config/optional/tour.tour.language.yml

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+id: language
+module: language
+label: Language
+langcode: en
+routes:
+  - route_name: entity.configurable_language.collection
+tips:
+  language-overview:
+    id: language-overview
+    plugin: text
+    label: Languages
+    body: '<p>The "Languages" page allows you to add, edit, delete, and reorder languages for the site.</p>'
+    weight: 1
+  language-add:
+    id: language-add
+    plugin: text
+    label: 'Adding languages'
+    body: '<p>To add more languages to your site, click the "Add language" button.</p><p>Added languages will be displayed in the language list and can then be edited or deleted.</p>'
+    weight: 2
+    attributes:
+      data-class: button-action
+  language-reorder:
+    id: language-reorder
+    plugin: text
+    label: 'Reordering languages'
+    body: '<p>To reorder the languages on your site, use the drag icons next to each language.</p><p>The order shown here is the display order for language lists on the site such as in the language switcher blocks provided by the Interface Translation and Content Translation modules.</p><p>When you are done with reordering the languages, click the "Save configuration" button for the changes to take effect.</p>'
+    weight: 3
+    attributes:
+      data-class: draggable
+  language-default:
+    id: language-default
+    plugin: text
+    label: 'Set a language as default'
+    body: '<p>You can change the default language of the site by choosing one of your configured languages as default. The site will use the default language in situations where no choice is made but a language should be set, for example as the language of the displayed interface.</p>'
+    weight: 4
+    attributes:
+      data-class: form-item-site-default-language
+  language-operations:
+    id: language-operations
+    plugin: text
+    label: 'Modifying languages'
+    body: '<p>Operations are provided for editing and deleting your languages.</p><p>You can edit the name and the direction of the language.</p><p>Deleted languages can be added back at a later time. Deleting a language will remove all interface translations associated with it, and content in this language will be set to be language neutral. Note that you cannot delete the default language of the site.</p>'
+    weight: 5
+    attributes:
+      data-class: dropbutton-wrapper
+  language-continue:
+    id: language-continue
+    plugin: text
+    label: 'Continuing on'
+    body: '<p>Now that you have an overview of the "Languages" page, you can continue by:<ul><li><a href="[site:url]/admin/config/regional/language/add">Adding a language</a></li><li>Reordering languages</li><li>Editing a language</li><li>Deleting a language</li></ul></p>'
+    weight: 6

core/modules/language/config/schema/language.schema.yml

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+# Schema for the configuration files of the Language module.
+
+language_type_negotiation:
+  type: mapping
+  label: 'Language negotiation per type setting'
+  mapping:
+    enabled:
+      type: sequence
+      label: 'Enabled negotiators'
+      sequence:
+        type: integer
+        label: Weight
+    method_weights:
+      type: sequence
+      label: 'Negotiator weights'
+      sequence:
+        type: integer
+        label: Weight
+
+language.types:
+  type: config_object
+  label: 'Language types'
+  mapping:
+    all:
+      type: sequence
+      label: 'All language types'
+      sequence:
+        type: string
+        label: 'Language type'
+    configurable:
+      type: sequence
+      label: 'Configurable language types'
+      sequence:
+        type: string
+        label: 'Language type'
+    negotiation:
+      type: sequence
+      label: 'Language negotiation per type settings'
+      sequence:
+        type: language_type_negotiation
+        label: 'Language negotiation per type setting'
+
+language.negotiation:
+  type: config_object
+  label: 'Language detection methods'
+  mapping:
+    session:
+      type: mapping
+      label: 'Session'
+      mapping:
+        parameter:
+          type: string
+          label: 'Request/session parameter'
+    url:
+      type: mapping
+      label: 'Language from the URL (Path prefix or domain).'
+      mapping:
+        source:
+          type: string
+          label: 'Part of the URL that determines language'
+        prefixes:
+          type: sequence
+          label: 'Path prefix configuration'
+          sequence:
+            type: string
+            label: 'Path prefix'
+        domains:
+          type: sequence
+          label: 'Domain configuration'
+          sequence:
+            type: string
+            label: 'Domain'
+    selected_langcode:
+      type: string
+      label: 'Selected language'
+
+language.mappings:
+  type: config_object
+  label: 'Language mapping'
+  mapping:
+    map:
+      type: sequence
+      sequence:
+        type: string
+        label: 'Language'
+
+language.entity.*:
+  type: config_entity
+  label: 'Language'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    label:
+      type: label
+      label: 'Label'
+    direction:
+      type: string
+      label: 'Direction'
+    weight:
+      type: integer
+      label: 'Weight'
+    locked:
+      type: boolean
+      label: 'Locked'
+
+language.content_settings.*.*:
+  type: config_entity
+  label: 'Content Language Settings'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    target_entity_type_id:
+      type: string
+      label: 'Entity Type ID'
+    target_bundle:
+      type:  string
+      label: 'Bundle'
+    default_langcode:
+      type: string
+      label: 'Default language'
+    language_alterable:
+      type: boolean
+      label: 'Allow to alter the language'
+
+condition.plugin.language:
+  type: condition.plugin
+  mapping:
+    langcodes:
+      type: sequence
+      sequence:
+        type: string