Keyboard Shortcuts in tooltips are always shown in default language

[Frog23]

The keyboard shortcuts that are displayed in the tooltips of UI elements, such as buttons, are always in the language of the OS and not in the language which is specified via Preferences -> Look and Feel -> Language. Since usually the language set there is the system language, this is probably hardly ever noticed and even if, it can be assumed that the user knowns what keyboard shortcuts are meant, since the system itself is in that language.
However I just wanted to create an English tutorial with screenshots and there it is confusing if the shortcuts are in German (as can be seen in the attached image: the German keys for Ctrl + Shift + Down).

[Frog23]

German keyboard shortcuts in English tooltip.

[stoecker]

This probably is the case for all texts which are handled by Java and not JOSM itself.

[bastiK]

I get consistent translation when setting the LANG environment variable, e.g.

$ LANG="de_DE.utf8" java -jar josm-custom.jar

or

$ LANG="en_US.utf8" java -jar josm-custom.jar

But I think this only works for the languages that are supported by Java (excluding Russian and Chinese among others).

Edit: Chinese seems to be supported:

java6/sun/awt/resources$ ls
awt_de.java  awt_fr.java  awt_ja.java  awt_ko.java  awt_zh_CN.java  awt_zh_TW.java
awt_es.java  awt_it.java  awt.java     awt_sv.java  awt_zh_HK.java

[skyper]

duplicate of #6345

[stoecker]

Closed as duplicate of #6345.