StringIndexOutOfBoundsException: begin 0, end -1, length 4

[naoliv]

If I run JOSM with pt_BR as my locale, I can see this while JOSM is trying to load EasyPresets:

2021-03-30 00:17:58.064 INFORMAÇÕES: carregando plugin 'EasyPresets' (versão 1616852928)
2021-03-30 00:17:58.120 GRAVE: org.openstreetmap.josm.plugins.PluginException: Um erro ocorreu com o plugin EasyPresets. Causa: java.lang.reflect.InvocationTargetException. Causa: java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 4
org.openstreetmap.josm.plugins.PluginException: Um erro ocorreu com o plugin EasyPresets
	at org.openstreetmap.josm.plugins.PluginInformation.load(PluginInformation.java:379)
	at org.openstreetmap.josm.plugins.PluginHandler.loadPlugin(PluginHandler.java:808)
	at org.openstreetmap.josm.plugins.PluginHandler.loadPlugins(PluginHandler.java:893)
	at org.openstreetmap.josm.plugins.PluginHandler.loadLatePlugins(PluginHandler.java:945)
	at org.openstreetmap.josm.gui.MainApplication.loadLatePlugins(MainApplication.java:1200)
	at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:950)
	at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:280)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:737)
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
	at org.openstreetmap.josm.plugins.PluginInformation.load(PluginInformation.java:374)
	... 7 more
Caused by: java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 4
	at java.base/java.lang.String.checkBoundsBeginEnd(String.java:3734)
	at java.base/java.lang.String.substring(String.java:1903)
	at org.maripo.josm.easypresets.data.EasyPresets.load(EasyPresets.java:155)
	at org.maripo.josm.easypresets.data.EasyPresets.load(EasyPresets.java:140)
	at org.maripo.josm.easypresets.EasyPresetsPlugin.<init>(EasyPresetsPlugin.java:35)

If I set LC_ALL=C or run it with josm --language=en, JOSM properly loads the plugin.

My system locale:

LANG=pt_BR.UTF-8
LANGUAGE=pt_BR:pt:en
LC_CTYPE="pt_BR.UTF-8"
LC_NUMERIC="pt_BR.UTF-8"
LC_TIME="pt_BR.UTF-8"
LC_COLLATE="pt_BR.UTF-8"
LC_MONETARY="pt_BR.UTF-8"
LC_MESSAGES="pt_BR.UTF-8"
LC_PAPER="pt_BR.UTF-8"
LC_NAME="pt_BR.UTF-8"
LC_ADDRESS="pt_BR.UTF-8"
LC_TELEPHONE="pt_BR.UTF-8"
LC_MEASUREMENT="pt_BR.UTF-8"
LC_IDENTIFICATION="pt_BR.UTF-8"
LC_ALL=

JOSM:

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-03-29 23:05:59 +0200 (Mon, 29 Mar 2021)
Revision:17687
Build-Date:2021-03-30 01:30:56
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (17687 pt_BR) Linux Debian GNU/Linux bullseye/sid
Memory Usage: 682 MB / 2048 MB (302 MB allocated, but free)
Java version: 15.0.2+7-Debian-1, Debian, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 1920×1080 (scaling 1,00×1,00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→16×16, 32×32→32×32
Java ATK Wrapper package: libatk-wrapper-java:all-0.38.0-2
Environment variable LANG: pt_BR.UTF-8
libcommons-compress-java: libcommons-compress-java:all-1.20-1
libcommons-logging-java: libcommons-logging-java:all-1.2-2
VM arguments: [-Dawt.useSystemAAFontSettings=gasp]

Plugins:
+ EasyPresets
+ FastDraw (35640)
+ OpeningHoursEditor (35640)
+ SimplifyArea (35640)
+ apache-commons (35524)
+ buildings_tools (35669)
+ ejml (35458)
+ geotools (35458)
+ http2 (35427)
+ jaxb (35543)
+ jogl (1.2.3)
+ jts (35458)
+ log4j (35458)
+ measurement (35640)
+ opendata (35640)
+ reverter (35688)
+ tageditor (35640)
+ tagging-preset-tester (35640)
+ todo (30306)
+ turnlanes-tagging (288)
+ turnrestrictions (35640)
+ undelete (35640)
+ utilsplugin2 (35691)
+ wikipedia (1.1.4)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Golf_Course&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Healthcare&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Industrial&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Playground_Equipment&zip=1
+ /tmp/saida.xml

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface-DataEntry&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Noname&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_features_ryg&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Highway_Nodes&zip=1
- /tmp/newnodes.mapcss
- https://github.com/OSMBrasil/mapnik-brasil/archive/master.zip 
+ https://raw.githubusercontent.com/<user.name>/osm-gambi/master/fixme.mapcss
- /tmp/a.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1
- <josm.pref>/styles/sit.mapcss

Validator rules:
+ ${HOME}/git/validador-josm/Rules_Brazilian-Specific.validator.mapcss
+ ${HOME}/git/validador-josm/staging.validator.mapcss
- /tmp/caray.validator.mapcss
+ ${HOME}/git/validador-josm/nome-ruas-numeros.validator.mapcss
+ ${HOME}/git/osm-gambi/local.validator.mapcss

Last errors/warnings:
- 00009,716 W: Not a single layer for the name 'Imagem Premium da DigitalGlobe': []
- 00009,725 W: Falha ao carregar estilos Mappaint de '/tmp/newnodes.mapcss'. A exceção foi: java.nio.file.NoSuchFileException: /tmp/newnodes.mapcss
- 00009,726 E: java.nio.file.NoSuchFileException: /tmp/newnodes.mapcss
- 00009,754 W: Falha ao carregar estilos Mappaint de '/tmp/a.mapcss'. A exceção foi: java.nio.file.NoSuchFileException: /tmp/a.mapcss
- 00009,755 E: java.nio.file.NoSuchFileException: /tmp/a.mapcss
- 00011,615 E: java.nio.file.NoSuchFileException: /tmp/saida.xml
- 00011,615 E: /tmp/saida.xml
- 00014,273 E: org.openstreetmap.josm.plugins.PluginException: Um erro ocorreu com o plugin EasyPresets. Causa: java.lang.reflect.InvocationTargetException. Causa: java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 4
- 00014,304 W: Desabilitar plugin - Não foi possível carregar plugin 'EasyPresets'. Apagar das preferências?