i18n

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "vendor/luasocket"]
 	path = vendor/luasocket
 	url = https://github.com/diegonehab/luasocket.git
+[submodule "vendor/tinygettext"]
+	path = vendor/tinygettext
+	url = https://github.com/tinygettext/tinygettext.git

ThirdParty_LICENSES

@@ -586,4 +586,41 @@ and desktop fonts contain some icons that are redistributed under the Apache
 licenses or are distributed under the Apache 2.0 license.
 
 # Code: MIT (https://opensource.org/licenses/MIT)
-The MIT license applies to all non-font and non-icon files.
+The MIT license applies to all non-font and non-icon files.
+
+================== tinygettext ================
+
+tinygettext - A gettext replacement that works directly on .po files
+
+Copyright (c) 2004-2016
+
+* Bastiaan Zapf <bzapf@example.org>
+* Christoph Sommer <mail@christoph-sommer.de>
+* Georg Kilzer (leper) <leper@wildfiregames.com>
+* Ingo Ruhnke <grumbel@gmail.com>
+* Mathnerd314 <mathnerd314.gph@gmail.com>
+* Matt McCutchen <matt@mattmccutchen.net>
+* Matthias Braun <matze@braunis.de>
+* Nathan Phillip Brink <ohnobinki@ohnopublishing.net>
+* Poren Chiang <ren.chiang@gmail.com>
+* Ravu al Hemio <ondra.hosek@gmail.com>
+* Ryan Flegel <rflegel@gmail.com>
+* Tim Goya <tuxdev103@gmail.com>
+* Tobias Markus <tobbi.bugs@gmail.com>
+* Wolfgang Becker <uafr@gmx.de>
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgement in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

Translation.md

@@ -0,0 +1,92 @@
+# Translation
+
+Instructions on how to create and update the language files for CET.
+
+## For translators
+
+The language files have the extension name of ".po". The file names are generally using [two-letter language codes](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) (e.g. en, fr, de). For languages that have different writing systems or to differentiate by country, the file name needs to be a locale with an underscore (e.g. zh_CN, zh_TW).
+
+### Use Crowdin
+
+Todo
+
+
+### Use commandline scripts:
+
+### Create a new language file
+To create a new language, use the following command:
+```sh
+xmake i18n-po create filename
+```
+This will generate a new po file under the `languages/` directory. Make sure the filename follows the rules above. Otherwise, the language name won't be parsed by CET correctly.
+
+### Update the language files
+To update those files, use the following command:
+```sh
+xmake i18n-po update
+```
+This will add new translatable strings from `template.pot` file to all `.po` files.
+
+### Edit the language files
+To edit the language files, you can either edit them on Crowdin or open them in a text editor or a PO editor.
+
+### Test the translations
+You can reload the translations from `Settings->CET Development Settings->Reload translation`.
+
+If you are editing the language files from the project directory. Use the following command to copy the language files to your game directory:
+```sh
+xmake i18n-install
+```
+
+## Format
+
+The language files are using the GNU gettext PO format. Detailed documentation can be found [here](https://www.gnu.org/software/gettext/manual/html_node/PO-Files.html).
+```po
+white-space
+#  translator-comments
+#. extracted-comments
+#: reference…
+#, flag…
+#| msgid previous-untranslated-string
+msgid untranslated-string
+msgstr translated-string
+```
+## For developers
+
+There are two macros you can use the mark the translatable strings.
+
+To translate normal strings, use:
+```cpp
+_t("This string will be translated.");
+```
+
+To translate strings with plural forms:
+```cpp
+_t("There is %d apple.", "There are %d apples.", number);
+```
+
+If you have strings inside a container that you want to translate. You can use the `_noop("string")` to mark it for translation. For example:
+```cpp
+std::vector<std::string> fruits = {
+    _noop("apple"),
+    _noop("banana"),
+    _noop("orange")
+};
+
+for (const auto& fruit : list)
+{
+    Log::Info(_t(fruit));
+}
+```
+
+Always remember to update the `template.pot` file before you commit the changes you made to the translatable strings. So translators can start to work on updating the translations.
+
+### Update the template file
+
+The template file `template.pot` is auto-generated from the source files. It includes all the translatable strings in the source files.
+
+To update this file, use the following command:
+```sh
+xmake i18n-pot
+```
+This will also auto-update the `en.po` file. `en.po` is always auto-generated from the template file, so there's no need to edit it.

crowdin.yml

@@ -0,0 +1,10 @@
+pull_request_title: Update Translation
+commit_message: '[ci skip]'
+files:
+  - source: /languages/template.pot
+    translation: /languages/%two_letters_code%.po
+    update_option: update_as_unapproved
+    languages_mapping:
+      two_letters_code:
+        zh-CN: zh_CN
+        zh-TW: zh_TW