i18n: Use fake gettext if .mo files don't exist, and Django isn't installed

Author: Bjwebb

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+
+- Don't fail if compiled translation files (.mo) don't exist, and Django isn't installed
+
 ## [0.15.1] - 2020-10-21
 
 ### Fixed

flattentool/i18n.py

@@ -14,17 +14,21 @@
     except ImproperlyConfigured:
         raise ImportError
 
-    # We set up the translations ourselves, instead of using Django's gettext
-    # function, so that we can have a custom domain and locale directory.
-    translations = {}
-    translations["en"] = gettext.translation(domain, locale_dir, languages=["en"])
-    translations["es"] = gettext.translation(domain, locale_dir, languages=["es"])
+    try:
+        # We set up the translations ourselves, instead of using Django's gettext
+        # function, so that we can have a custom domain and locale directory.
+        translations = {}
+        translations["en"] = gettext.translation(domain, locale_dir, languages=["en"])
+        translations["es"] = gettext.translation(domain, locale_dir, languages=["es"])
 
-    def _(text):
-        lang = get_language()
-        if lang not in translations:
-            lang = "en"
-        return translations[lang].gettext(text)
+        def _(text):
+            lang = get_language()
+            if lang not in translations:
+                lang = "en"
+            return translations[lang].gettext(text)
+    except FileNotFoundError:
+        # If .mo files don't exist, pass a fake gettext function instead
+        _ = lambda x: x
 
 
 except ImportError: