Fix chapter refresh failing in locales with non-ASCII digits

Closes #4075

CHANGELOG.md

@@ -35,6 +35,9 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 ### Removed
 - Remove "Custom hardware bitmap threshold" and "Custom display profile" advanced settings ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3786](https://github.com/mihonapp/mihon/pull/3786))
 
+### Fixed
+- Fixed refreshing chapters failing with the app language set to Arabic or another language with its own digits ([@AntsyLich](https://github.com/AntsyLich))
+
 ## [v0.21.0] - 2026-10-12
 ### Added
 - Add `id:` prefix search to remaining trackers (AniList, Bangumi, Kitsu, MangaUpdates, Shikimori, and Hikka) ([@MajorTanya](https://github.com/MajorTanya), [@BrutuZ](https://github.com/BrutuZ)) ([#3776](https://github.com/mihonapp/mihon/pull/3776))

domain/src/main/java/tachiyomi/domain/chapter/service/ChapterRecognition.kt

@@ -3,6 +3,7 @@ package tachiyomi.domain.chapter.service
 import tachiyomi.domain.chapter.model.Chapter
 import java.text.DecimalFormat
 import java.text.DecimalFormatSymbols
+import java.util.Locale
 import kotlin.math.floor
 import kotlin.math.round
 
@@ -77,9 +78,9 @@ object ChapterRecognition {
     private val prologue = Regex("""\b(?:prologue|one.?shot|pilot)\b""")
 
     /**
-     * Formats numbers without trailing zeros and with a dot whatever the locale, e.g. 10.5, 3, 24.005
+     * Formats numbers without trailing zeros, with ASCII digits and a dot whatever the locale, e.g. 10.5, 3, 24.005
      */
-    private val formatter = DecimalFormat("#.###", DecimalFormatSymbols().apply { decimalSeparator = '.' })
+    private val formatter = DecimalFormat("#.###", DecimalFormatSymbols(Locale.ROOT))
 
     /**
      * The volume and chapter number recognized for a chapter, e.g. "10.5" or "19a", `null` when there is none.