Remapping failes because of missing localisation.

Start by reproducing the remapping run on Windows with the German locale, then trace the reported path through RemapperTask.extractRange, RangeExtractor.generateRangeMap, and Util.createUnit. The fix is complete when a 1.12-to-1.13 mapping updates files without the MissingResourceException or repeated missing-message warnings.

I am running a win 10 (1903) and the system lang is german. I tried to update the mapping of a 1.12 project (to 1.13 mappings). But it did not change any file so I checked the logs (by running it froim cmd)

Version: 0.1 (fatjar)

Error:

Missing resource : org/eclipse/jdt/internal/compiler/batch/messages.properties for locale de_DE
java.util.MissingResourceException: Can't find bundle for base name org.eclipse.jdt.internal.compiler.batch.messages, locale de_DE
        at java.util.ResourceBundle.throwMissingResourceException(Unknown Source)
        at java.util.ResourceBundle.getBundleImpl(Unknown Source)
        at java.util.ResourceBundle.getBundle(Unknown Source)
        at org.eclipse.jdt.internal.compiler.batch.Main$ResourceBundleFactory.getBundle(Main.java:1294)
        at org.eclipse.jdt.internal.compiler.batch.Main.relocalize(Main.java:4556)
        at org.eclipse.jdt.internal.compiler.batch.Main.relocalize(Main.java:4550)
        at org.eclipse.jdt.internal.compiler.batch.Main.<init>(Main.java:1499)
        at org.eclipse.jdt.core.dom.ASTParser.getClasspath(ASTParser.java:238)
        at org.eclipse.jdt.core.dom.ASTParser.internalCreateAST(ASTParser.java:1193)
        at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:812)
        at net.minecraftforge.srg2source.util.Util.createUnit(Util.java:361)
        at net.minecraftforge.srg2source.ast.RangeExtractor.generateRangeMap(RangeExtractor.java:165)
        at net.minecraftforge.remapper.RemapperTask.extractRange(RemapperTask.java:128)
        at net.minecraftforge.remapper.RemapperTask.runRemapMod_Thread(RemapperTask.java:46)
        at net.minecraftforge.remapper.RemapperTask$1.run(RemapperTask.java:39)
        at java.lang.Thread.run(Unknown Source)

Also log is full of these:

Warning: NLS missing message: WM_errors in: org.eclipse.core.internal.utils.messages
Warning: NLS missing message: WM_jobName in: org.eclipse.core.internal.utils.messages
Warning: NLS missing message: WM_nativeErr in: org.eclipse.core.internal.utils.messages