feat: stardandize templates to support atlas

Refs: FC-0012 OEP-58

cookiecutter-xblock/{{cookiecutter.repo_name}}/Makefile

@@ -7,10 +7,10 @@
 
 REPO_NAME := {{cookiecutter.repo_name}}
 PACKAGE_NAME := {{cookiecutter.package_name}}
-EXTRACT_DIR := $(PACKAGE_NAME)/locale/en/LC_MESSAGES
-EXTRACTED_DJANGO := $(EXTRACT_DIR)/django-partial.po
-EXTRACTED_DJANGOJS := $(EXTRACT_DIR)/djangojs-partial.po
-EXTRACTED_TEXT := $(EXTRACT_DIR)/text.po
+EXTRACT_DIR := $(PACKAGE_NAME)/conf/locale/en/LC_MESSAGES
+EXTRACTED_DJANGO_PARTIAL := $(EXTRACT_DIR)/django-partial.po
+EXTRACTED_DJANGOJS_PARTIAL := $(EXTRACT_DIR)/djangojs-partial.po
+EXTRACTED_DJANGO := $(EXTRACT_DIR)/django.po
 JS_TARGET := public/js/translations
 TRANSLATIONS_DIR := $(PACKAGE_NAME)/translations
 
@@ -59,8 +59,14 @@ dev.run: dev.clean dev.build ## Clean, build and run test image
 
 extract_translations: symlink_translations ## extract strings to be translated, outputting .po files
 	cd $(PACKAGE_NAME) && i18n_tool extract
-	mv $(EXTRACTED_DJANGO) $(EXTRACTED_TEXT)
-	if [ -f "$(EXTRACTED_DJANGOJS)" ]; then cat $(EXTRACTED_DJANGOJS) >> $(EXTRACTED_TEXT); rm $(EXTRACTED_DJANGOJS); fi
+	mv $(EXTRACTED_DJANGO_PARTIAL) $(EXTRACTED_DJANGO)
+	# Use msgcat to concatenate djangojs if it exists
+	if test -f $(EXTRACTED_DJANGOJS_PARTIAL); then \
+	  msgcat $(EXTRACTED_DJANGO) $(EXTRACTED_DJANGOJS_PARTIAL) -o $(EXTRACTED_DJANGO) && \
+	  rm $(EXTRACTED_DJANGOJS_PARTIAL); \
+	fi
+	sed -i'' -e 's/nplurals=INTEGER/nplurals=2/' $(EXTRACTED_DJANGO)
+	sed -i'' -e 's/plural=EXPRESSION/plural=\(n != 1\)/' $(EXTRACTED_DJANGO)
 
 compile_translations: symlink_translations ## compile translation files, outputting .mo files for each supported language
 	cd $(PACKAGE_NAME) && i18n_tool generate