Initial work on translations / localization

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3841

Most of the preparation for this was done by Suguru Hirahara (https://github.com/luixxiul).
I've merely reorganized/polished the scripts and instructions in the `i18n/` directory.

While translations can happen even now, more work is necessary to

- make the translation flow better (integrating Weblate), etc.

- restore the Github Actions workflows that Suguru Hirahara had already developed to
  adapt them to our new workflow

i18n/locales/jp/LC_MESSAGES/docs/configuring-playbook-appservice-double-puppet.po

@@ -0,0 +1,107 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) 2018-2024, Slavi Pantaleev, Aine Etke, MDAD community
+# members
+# This file is distributed under the same license as the
+# matrix-docker-ansible-deploy package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2024.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: matrix-docker-ansible-deploy \n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2024-12-16 12:05+0900\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: jp\n"
+"Language-Team: jp <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.16.0\n"
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:1
+msgid "Setting up Appservice Double Puppet (optional)"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:3
+msgid ""
+"Appservice Double Puppet is a homeserver appservice through which bridges"
+" (and potentially other services) can impersonate any user on the "
+"homeserver."
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:5
+msgid ""
+"This is useful for performing [double-"
+"puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html) via"
+" the [appservice method](https://docs.mau.fi/bridges/general/double-"
+"puppeting.html#appservice-method-new). The Appservice Double Puppet "
+"service is an implementation of this approach."
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:7
+msgid ""
+"Previously, bridges supported performing [double-"
+"puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html) "
+"with the help of the [Shared Secret Auth password provider module"
+"](./configuring-playbook-shared-secret-auth.md), but this old and hacky "
+"solution has been superseded by this Appservice Double Puppet method."
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:9
+msgid "Adjusting the playbook configuration"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:11
+msgid ""
+"To enable the Appservice Double Puppet service, add the following "
+"configuration to your `inventory/host_vars/matrix.example.com/vars.yml` "
+"file:"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:17
+msgid "Installing"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:19
+msgid ""
+"After configuring the playbook, run it with [playbook tags](playbook-"
+"tags.md) as below:"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:26
+msgid "**Notes**:"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:28
+msgid ""
+"The `ensure-matrix-users-created` playbook tag makes the playbook "
+"automatically create the bot's user account."
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:30
+msgid ""
+"The shortcut commands with the [`just` program](just.md) are also "
+"available: `just install-all` or `just setup-all`"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:32
+msgid ""
+"`just install-all` is useful for maintaining your setup quickly ([2x-5x "
+"faster](../CHANGELOG.md#2x-5x-performance-improvements-in-playbook-"
+"runtime) than `just setup-all`) when its components remain unchanged. If "
+"you adjust your `vars.yml` to remove other components, you'd need to run "
+"`just setup-all`, or these components will still remain installed."
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:34
+msgid "Usage"
+msgstr ""
+
+#: ../../../docs/configuring-playbook-appservice-double-puppet.md:36
+msgid ""
+"When enabled, double puppeting will automatically be enabled for all "
+"bridges that support double puppeting via the appservice method."
+msgstr ""
+