Merge manually PR #2633

doc/es_ES/translations.markdown

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+Translations
+============
+
+How to translate Kanboard to a new language?
+--------------------------------------------
+
+- Translations are stored inside the directory `app/Locale`
+- There is a subdirectory for each language, for example in French we have `fr_FR`, Italian `it_IT` etc.
+- A translation is a PHP file that returns an Array with a key-value pairs
+- The key is the original text in English and the value is the translation of the corresponding language
+- **French translations are always up to date**
+- Always use the last version (branch master)
+
+### Create a new translation:
+
+1. Make a new directory: `app/Locale/xx_XX` for example `app/Locale/fr_CA` for French Canadian
+2. Create a new file for the translation: `app/Locale/xx_XX/translations.php`
+3. Use the content of the French locales and replace the values
+4. Update the file `app/Model/Language.php`
+5. Check with your local installation of Kanboard if everything is OK
+6. Send a [pull-request with Github](https://help.github.com/articles/using-pull-requests/)
+
+How to update an existing translation?
+--------------------------------------
+
+1. Open the translation file `app/Locale/xx_XX/translations.php`
+2. Missing translations are commented with `//` and the values are empty, just fill blank and remove the comment
+3. Check with your local installation of Kanboard and send a [pull-request](https://help.github.com/articles/using-pull-requests/)
+
+How to add new translated text in the application?
+--------------------------------------------------
+
+Translations are displayed with the following functions in the source code:
+
+- `t()`: display text with HTML escaping
+- `e()`: display text without HTML escaping
+
+Always use the english version in the source code.
+
+Text strings use the function `sprintf()` to replace elements:
+
+- `%s` is used to replace a string
+- `%d` is used to replace an integer
+
+All formats are available in the [PHP documentation](http://php.net/sprintf).
+
+How to find missing translations in the applications?
+-----------------------------------------------------
+
+From a terminal, run the following command:
+
+```bash
+./kanboard locale:compare
+```
+
+All missing and unused translations are displayed on the screen.
+Put that in the French locale and sync other locales (see below).
+
+How to synchronize translation files?
+-------------------------------------
+
+From a Unix shell run this command:
+
+```bash
+./kanboard locale:sync
+```
+
+The French translation is used a reference to other locales.