[FIX] translate the documentation

Monkeypatch the docname_to_domain to avoid having one big "application.pot" file

Makefile

@@ -55,13 +55,10 @@ latexpdf:
 	cp $(BUILD_DIR)/latex/*.pdf $(BUILD_DIR)/html/
 	@echo "Build finished."
 
-l10n:
+gettext:
 	@echo "Generating translatable files..."
-	$(SPHINX_BUILD) -c $(CONFIG_DIR) -b gettext $(SOURCE_DIR) $(BUILD_DIR)/gettext
+	$(SPHINX_BUILD) -c $(CONFIG_DIR) -b gettext $(SOURCE_DIR) locale/sources
 	@echo "Generation finished."
-	@echo "Localizing translation strings..."
-	sphinx-intl update -p $(BUILD_DIR)/gettext -l $(L10N_LANGUAGES)
-	@echo "Localization finished."
 
 extensions/odoo_theme/static/style.css: extensions/odoo_theme/static/style.scss extensions/odoo_theme/static/scss/*.scss
 	@echo "Compiling stylesheets..."

conf.py

@@ -5,6 +5,7 @@ from pathlib import Path
 
 from pygments.lexers import JsonLexer, XmlLexer
 from sphinx.util import logging
+import sphinx
 
 _logger = logging.getLogger(__name__)
 
@@ -128,7 +129,13 @@ intersphinx_mapping = {
 github_user = 'odoo'
 github_project = 'documentation'
 
-locale_dirs = ['locale/']
+locale_dirs = ['../locale/']
+
+# custom docname_to_domain to devide the translations of applications in subdirectories
+sphinx.transforms.i18n.docname_to_domain = (
+    sphinx.util.i18n.docname_to_domain
+) = lambda docname, compact: docname.split('/')[1 if docname.startswith('applications/') else 0]
+
 supported_languages = {
     'de': 'Deutsch',
     'en': 'English',