Remove useless template, clean translation, add Transifex config

.tx/config

fabfile.py

umap/locale/en/LC_MESSAGES/django.po

umap/locale/es/LC_MESSAGES/django.po

umap/locale/fi/LC_MESSAGES/django.po

umap/locale/fr/LC_MESSAGES/django.po

umap/locale/it/LC_MESSAGES/django.po

umap/locale/nl/LC_MESSAGES/django.po

umap/locale/pt/LC_MESSAGES/django.po

umap/templates/base.html

umap/templates/leaflet_storage/datalayer_form.html

umap/templates/leaflet_storage/feature_detail.html

umap/templates/leaflet_storage/feature_form.html

umap/templates/leaflet_storage/map_detail.html

umap/templates/leaflet_storage/map_form.html

umap/templates/leaflet_storage/upload_form.html