fixed checking the installed languages.

src/paperless_tesseract/checks.py

@@ -14,12 +14,21 @@ def get_tesseract_langs():
 
 @register()
 def check_default_language_available(app_configs, **kwargs):
-    langs = get_tesseract_langs()
+    installed_langs = get_tesseract_langs()
 
-    if settings.OCR_LANGUAGE not in langs:
+    if not settings.OCR_LANGUAGE:
+        return [Warning(
+            "No OCR language has been specified with PAPERLESS_OCR_LANGUAGE. "
+            "This means that tesseract will fallback to english."
+        )]
+
+    specified_langs = settings.OCR_LANGUAGE.split("+")
+
+    for lang in specified_langs:
+        if lang not in installed_langs:
             return [Error(
-            f"The default ocr language {settings.OCR_LANGUAGE} is "
+                f"The selected ocr language {lang} is "
                 f"not installed. Paperless cannot OCR your documents "
                 f"without it. Please fix PAPERLESS_OCR_LANGUAGE.")]
-    else:
+
     return []