use polyglot for detecting the language

app/language.py

@@ -1,3 +1,36 @@
 from argostranslate import translate
+from polyglot.detect.base import Detector
 
-languages = translate.load_installed_languages()
+
+languages = translate.load_installed_languages()
+
+
+__lang_codes = [l.code for l in languages]
+
+
+def detect_languages(text):
+    f = Detector(text).languages
+
+    # get the candidates
+    candidate_langs = list(filter(lambda l: l.read_bytes != 0 and l.code in __lang_codes, f))
+
+    # this happens if no language can be detected
+    if not candidate_langs:
+        # use language "en" by default but with zero confidence
+        return [
+                    {
+                        'confidence': 0.0,
+                        'language': "en"
+                    }
+                ]
+
+    # sort the candidates descending based on the detected confidence
+    candidate_langs.sort(key=lambda l: l.confidence, reverse=True)
+
+    return [
+                {
+                    'confidence': l.confidence,
+                    'language': l.code
+                }
+                for l in candidate_langs
+            ]