CONTRIBUTE add how-to for generating translations

CHANGELOG.md

@@ -1,3 +1,9 @@
+## next version
+
+### Features:
+* Add Information about how to create translations to CONTRIBUTE.md ([#PR35](https://github.com/WhereGroup/qgis2mapbender/pull/35))
+
+
 ## v1.1.0
 
 ### Features:

CONTRIBUTE.md

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 # Contribute
 
 Contributors are welcome to extend the plugin's features further. Please fork the repository and make a pull request if your feature is ready. Just creating issues also helps to maintain the plugin working. Please, provide a meaningful example.
+
+## Translations
+
+Translation files are placed in the folder i18n of the plugin. 
+
+You can copy an existing .ts file and translate it to your language (sections translation). 
+Please name the new file according to the following scheme: `xx.ts`, where `xx` is the [ISO 639-1 language code](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) of your language (e.g. `de` for German, `es` for Spanish, `it` for Italian, etc.).
+You can use [Qt Linguist](https://doc.qt.io/qt-5/qtlinguist-index.html) to translate the strings in the .ts file.
+
+You have to create a .qm file from the .ts file after translating it. You can use the `lrelease` tool from the Qt framework to do this. The command is as follows:
+
+```
+lrelease path/to/yourfile.ts
+```
+
+After translating the strings in the .ts file and the creation of the .qm file, please create a pull request with your new translation file included in the i18n folder of the repository. This way, your translation can be included in future releases of the plugin.

README.md

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 ## License
 The plugin is licensed under the attached GNU General Public License.
+
+## Translations
+Translation files are placed in the folder i18n of the plugin. If you want to contribute a translation, please have a look at the CONTRIBUTE.md file.