Put app strings into a YAML file for easy editing by product owner

atst/utils/localization.py

@@ -0,0 +1,35 @@
+import yaml
+import os
+from functools import lru_cache
+from atst.utils import getattr_path
+
+ENV = os.getenv("FLASK_ENV", "dev")
+
+
+class LocalizationInvalidKeyError(Exception):
+    def __init__(self, key, variables):
+        self.key = key
+        self.variables = variables
+
+    def __str__(self):
+        return "Requested {key} and variables {variables} with but an error occured".format(
+            key=self.key, variables=self.variables
+        )
+
+
+localizations_cache_size = 1 if ENV == "dev" else None
+
+
+@lru_cache(maxsize=localizations_cache_size)
+def load_cached_translations_file(file_name):
+    return open(file_name).read()
+
+
+def translate(key, variables={}):
+    translations = yaml.safe_load(load_cached_translations_file("translations.yaml"))
+    value = getattr_path(translations, key)
+
+    if value == None:
+        raise LocalizationInvalidKeyError(key, variables)
+
+    return value.format(**variables).replace("\n", "")