- specify all mapping to lowercase with explicit en locale

src/pullRequests.ts

@@ -129,7 +129,7 @@ const mapPullRequest = (
   author: pr.user?.login || '',
   repoName: pr.base.repo.full_name,
   labels: new Set(
-    pr.labels?.map(lbl => lbl.name?.toLocaleLowerCase() || '') || []
+    pr.labels?.map(lbl => lbl.name?.toLocaleLowerCase('en') || '') || []
   ),
   milestone: pr.milestone?.title || '',
   body: pr.body || '',

src/tags.ts

@@ -67,7 +67,9 @@ export class Tags {
       const length = tags.length
       if (tags.length > 1) {
         for (let i = 0; i < length; i++) {
-          if (tags[i].name.toLocaleLowerCase() === tag.toLocaleLowerCase()) {
+          if (
+            tags[i].name.toLocaleLowerCase('en') === tag.toLocaleLowerCase('en')
+          ) {
             if (ignorePreReleases) {
               core.info(
                 `ℹ️ Enabled 'ignorePreReleases', searching for the closest release`

src/transform.ts

@@ -98,7 +98,7 @@ export function buildChangelog(
   for (const [pr, body] of transformedMap) {
     if (
       haveCommonElements(
-        ignoredLabels.map(lbl => lbl.toLocaleLowerCase()),
+        ignoredLabels.map(lbl => lbl.toLocaleLowerCase('en')),
         pr.labels
       )
     ) {
@@ -111,7 +111,7 @@ export function buildChangelog(
       if (category.exhaustive === true) {
         if (
           haveEveryElements(
-            category.labels.map(lbl => lbl.toLocaleLowerCase()),
+            category.labels.map(lbl => lbl.toLocaleLowerCase('en')),
             pr.labels
           )
         ) {
@@ -121,7 +121,7 @@ export function buildChangelog(
       } else {
         if (
           haveCommonElements(
-            category.labels.map(lbl => lbl.toLocaleLowerCase()),
+            category.labels.map(lbl => lbl.toLocaleLowerCase('en')),
             pr.labels
           )
         ) {
@@ -344,12 +344,12 @@ function extractValues(
   if (extractor.method === 'match') {
     const lables = onValue.match(extractor.pattern)
     if (lables !== null) {
-      return lables.map(label => label.toLocaleLowerCase())
+      return lables.map(label => label.toLocaleLowerCase('en'))
     }
   } else {
     const label = onValue.replace(extractor.pattern, extractor.target)
     if (label !== '') {
-      return [label.toLocaleLowerCase()]
+      return [label.toLocaleLowerCase('en')]
     }
   }
   return null