clean up, update message catalogs

src/natcap/invest/__init__.py

@@ -217,12 +217,12 @@ MODEL_METADATA = {
 
 
 def install_language(language_code):
-    # globally install the _() function for the requested language
+    """Globally install the _() function for the requested language."""
-    # fall back to a NullTranslation, which returns the English messages
     language = gettext.translation(
         'messages',
         languages=[language_code],
         localedir=LOCALE_DIR,
+        # fall back to a NullTranslation, which returns the English messages
         fallback=True)
     language.install()
     LOGGER.debug(f'Installed language "{language_code}"')

src/natcap/invest/carbon.py

@@ -17,7 +17,6 @@ from . import spec_utils
 from .spec_utils import u
 from . import MODEL_METADATA
 
-
 LOGGER = logging.getLogger(__name__)
 
 ARGS_SPEC = {

src/natcap/invest/ui_server.py

@@ -50,14 +50,17 @@ def shutdown():
 def get_invest_models():
     """Gets a list of available InVEST models.
 
+    Accepts a `language` query parameter which should be an ISO 639-1 language
+    code. Model names will be translated to the requested language if
+    translations are available, or fall back to English otherwise.
+
     Returns:
         A JSON string
     """
+    LOGGER.debug('get model list')
     install_language(request.args.get('language', 'en'))
     importlib.reload(natcap.invest)
-    LOGGER.debug('get model list')
+    return cli.build_model_list_json()
-    a = cli.build_model_list_json()
-    return a
 
 
 @app.route('/getspec', methods=['POST'])
@@ -65,6 +68,9 @@ def get_invest_getspec():
     """Gets the ARGS_SPEC dict from an InVEST model.
 
     Body (JSON string): "carbon"
+    Accepts a `language` query parameter which should be an ISO 639-1 language
+    code. Spec 'about' and 'name' values will be translated to the requested
+    language if translations are available, or fall back to English otherwise.
 
     Returns:
         A JSON string.
@@ -86,6 +92,10 @@ def get_invest_validate():
         model_module: string (e.g. natcap.invest.carbon)
         args: JSON string of InVEST model args keys and values
 
+    Accepts a `language` query parameter which should be an ISO 639-1 language
+    code. Validation messages will be translated to the requested language if
+    translations are available, or fall back to English otherwise.
+
     Returns:
         A JSON string.
     """