How to translate the JabRef User Interface

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How to translate the JabRef User Interface

Introduction
JabRef comes with a set of translations into 20 different languages: Chinese (simplified), Danish, Dutch, English, Farsi, French, German, Greek, Indonesian, Italian, Japanese, Norwegian, Persian, Portuguese, Portuguese (Brazil), Russian, Spanish, Swedish, Tagalog, Turkish and Vietnamese.
If the JabRef interface already exists in your language, you can help improve it. Otherwise, you can start translating JabRef into your own language.
Improving an existing translation
We use the service of Crowdin to keep our translations updated. It is a service directly running in the browser and one can quickly join and start translating.
visit https://translate.jabref.org/ to get started
select your preferred language, login, and click on JabRef_en.properties
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choose the string you want to translate in the left panel (strings to be translated are listed first)
and enter the translation in the central panel (suggestions are given at the bottom)
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Translating JabRef into a new language
Crowdin offers to quickly add a new language. Please contact us so that we add a new language for you.
Testing the translation
You may decide to wait for a new test version of JabRef to be published.
To test directly your translation, you must be able to compile the source tree after making your additions. This requires you to install the Java Development Kit. Ensure that you use the most recent version.
Crowdin allows for downloading the current translation file:
Screenshot of Crowdin download dialog
Place the downloaded file in the path src/main/resources/l10n. Then, execute gradlew run in the root directory and JabRef should start.
For a new language to be available within JabRef, a corresponding line must be added in the Java class GUIGlobals (found in the directory /src/main/java/org/jabref/logic/l10n/Languages.java in the JabRef source code tree). The line is inserted in the static {} section where the map LANGUAGES is populated. The code must of course be recompiled after this modification.
Localization in JabRef code
File location
For each language, there is the file JabRef_xx.properties (xx denotes the country code for the language). It contains all translations in a key/value format. In the JabRef source code tree, the property files reside in the /src/main/resources/l10n directory.
File format
Each entry is first given in English, then in the other language, with the two parts separated by an '=' character. For instance, a line can look like this in a German translation file:
Background\ color\ for\ optional\ fields=Hintergrundfarbe für optionale Felder
Note that each space character is escaped (\) to make it a valid property key. The translation value does not need any escapes.
Some entries contain "variables" that are inserted at runtime by JabRef - this can for instance be a file name or a file type name:
Synchronizing\ %0\ links...=Synchronisiere %0-Links...
A variable is denoted by %0, %1, %2 etc. In such entries, simply repeat the same notation in the translated version.
As we can see, there are several "special" characters: the percent sign and the equals sign, along with the colon character. If these characters are to be part of the actual text in an entry, they must be escaped in the English version, as with the colon in the following example:
Error\ writing\ XMP\ to\ file\:_%0=Fehler beim Schreiben von XMP in die Datei: %0
The character encoding should be UTF-8. Please avoid Unicode escaping such as \u2302.

How to Improve the Help Page

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Introduction

Improving an existing translation

Translating JabRef into a new language

Testing the translation

Localization in JabRef code

File location

File format