Advanced preferences: add-button unreadable (language: Dutch)

[Famlam]

What steps will reproduce the problem?

1. Set language to Dutch (or probably any long-word-language)
2. Open advanced preferences

What is the expected result?

Button text readable (or perhaps all with a minimum size, showing at least the first - say - 15 characters)

What happens instead?

Only one button gets truncated (to just "...")

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-10-03 13:42:38 +0200 (Sat, 03 Oct 2020)
Build-Date:2020-10-04 01:30:47
Revision:17084
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17084 nl) Windows 10 64-Bit
OS Build number: Windows 10 Home 2004 (19041)
Memory Usage: 760 MB / 1820 MB (465 MB allocated, but free)
Java version: 1.8.0_261-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 32x32, 32x32 -> 32x32

Plugins:
+ OpeningHoursEditor (35414)
+ imagery_offset_db (35405)
+ pt_assistant (2.1.10-80-g7d9bba3)
+ reverter (35556)
+ tageditor (35258)
+ turnlanes-tagging (283)
+ undelete (35521)
+ utilsplugin2 (35487)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1
+ %UserProfile%\Documents\tijdelijke bestanden\josm-eigen.mappaint.mapcss

Validator rules:
+ %UserProfile%\Documents\tijdelijke bestanden\josm-eigen.validator.mapcss