Add new global setting to control currency locale in reports

docs/docs/settings/global.md

@@ -142,6 +142,7 @@ Configuration of report generation:
 | Name | Description | Default | Units |
 | ---- | ----------- | ------- | ----- |
 {{ globalsetting("REPORT_ENABLE") }}
+{{ globalsetting("REPORT_CURRENCY_LOCALE") }}
 {{ globalsetting("REPORT_DEFAULT_PAGE_SIZE") }}
 {{ globalsetting("REPORT_DEBUG_MODE") }}
 {{ globalsetting("REPORT_FETCH_URLS") }}

src/backend/InvenTree/common/setting/system.py

@@ -671,6 +671,14 @@ SYSTEM_SETTINGS: dict[str, InvenTreeSettingsKeyType] = {
         'default': False,
         'validator': bool,
     },
+    'REPORT_CURRENCY_LOCALE': {
+        'name': _('Report Currency Locale'),
+        'description': _(
+            'Locale to use when rendering currency values in reports (e.g. en-US, fr-FR). Leave blank to use the system locale setting.'
+        ),
+        'default': '',
+        'validator': common.validators.validate_locale,
+    },
     'REPORT_DEBUG_MODE': {
         'name': _('Debug Mode'),
         'description': _('Generate reports in debug mode (HTML output)'),

src/backend/InvenTree/common/validators.py

@@ -4,6 +4,7 @@ import re
 
 from django.core.exceptions import SuspiciousFileOperation, ValidationError
 from django.core.files.storage import default_storage
+from django.utils import translation
 from django.utils.translation import gettext_lazy as _
 
 import common.icons
@@ -171,3 +172,17 @@ def validate_variable_string(value: str):
     """The passed value must be a valid variable identifier string."""
     if not re.match(r'^[a-zA-Z_][a-zA-Z0-9_]*$', value):
         raise ValidationError(_('Value must be a valid variable identifier'))
+
+
+def validate_locale(value: str):
+    """Validate that the provided value is a valid locale string."""
+    from babel import Locale
+    from babel.core import UnknownLocaleError
+
+    if not value:
+        return
+
+    try:
+        Locale.parse(translation.to_locale(value))
+    except (UnknownLocaleError, ValueError) as e:
+        raise ValidationError(f"Invalid locale value: '{value}' - {e}")

src/frontend/src/pages/Index/Settings/SystemSettings.tsx

@@ -197,6 +197,7 @@ export default function SystemSettings() {
           <GlobalSettingList
             keys={[
               'REPORT_ENABLE',
+              'REPORT_CURRENCY_LOCALE',
               'REPORT_DEFAULT_PAGE_SIZE',
               'REPORT_DEBUG_MODE',
               'REPORT_FETCH_URLS',