Update README and settings.py to address common issues and improve lo… (#306)

* Update README and settings.py to address common issues and improve localization support

- Added a section in README for common issues related to index row size in PostgreSQL, including solutions for disabling indexing and limiting translation languages.

* Enhance README with additional guidance on managing city and country imports

- Added new sections to the README detailing how to limit imported countries and cities in settings.py.
- Included instructions for excluding specific city and region types to optimize data imports.
- Expanded the common issues section to address index size errors and provide relevant solutions.

Author: marianoeramirez

README.rst

@@ -110,6 +110,49 @@ Consult the help with::
 
     ./manage.py help cities_light_fixtures
 
+
+Common issues
+--------------
+
+Search names index size issue
+------------------------------
+
+If you get the following error::
+
+    django.db.utils.OperationalError: index row size 2848 exceeds btree version 4 maximum 2704 for index "cities_light_city_search_names_fb77fed2"
+    DETAIL:  Index row references tuple (1314,1) in relation "cities_light_city".
+    HINT:  Values larger than 1/3 of a buffer page cannot be indexed.
+    Consider a function index of an MD5 hash of the value, or use full text indexing.
+
+You can fix it by adding the following to your settings.py, this will disable the indexing of the search_names field::
+    
+    CITIES_LIGHT_INDEX_SEARCH_NAMES = False
+
+Another option is limiting the languages for example to only English and abbreviation, this will fix the issue::
+    
+    CITIES_LIGHT_TRANSLATION_LANGUAGES = [ 'en',  'abbr']
+
+You want to import only the countries you need, for example France, Belgium and Netherlands, you can do it by adding the following to your settings.py::
+    
+    CITIES_LIGHT_INCLUDE_COUNTRIES = ['FR', 'BE', 'NL']
+
+You want to import only the cities you need, for example Paris, Brussels and Amsterdam, you can do it by adding the following to your settings.py::
+    
+    CITIES_LIGHT_INCLUDE_CITY_TYPES = ['PPL', 'PPLA', 'PPLA2', 'PPLA3', 'PPLA4', 'PPLC', 'PPLF', 'PPLG', 'PPLL', 'PPLR', 'PPLS', 'STLMT',]
+
+You don't want to import the cities and regions and subregions, you can do it by adding the following to your settings.py::
+    
+    CITIES_LIGHT_INCLUDE_CITY_TYPES = []
+    CITIES_LIGHT_INCLUDE_REGION_TYPES = []
+    CITIES_LIGHT_INCLUDE_SUBREGION_TYPES = []
+
+Or you can set the sources to empty list:
+
+    CITIES_LIGHT_REGION_SOURCES = []
+    CITIES_LIGHT_SUBREGION_SOURCES = []
+    CITIES_LIGHT_CITY_SOURCES = []
+
+
 Development
 -----------
 
@@ -166,13 +209,6 @@ To run it even faster, you can switch to specific tox virtualenv::
     CI=true test_project/manage.py test cities_light.tests.test_form.FormTestCase.testCountryFormNameAndContinentAlone
 
 
-If you want to generate the translations, use the following steps::
-    
-    source .tox/dev/bin/activate
-    cd src/cities_light
-    python manage.py makemessages -l fr
-    python manage.py compilemessages
-
 If you want to build the docs, use the following steps::
 
     source .tox/dev/bin/activate