Also support client side translations for plugins

src/octoprint/server/__init__.py

@@ -478,6 +478,57 @@ def robotsTxt():
 	return send_from_directory(app.static_folder, "robots.txt")
 
 
+@app.route("/i18n/<string:locale>/<string:domain>.js")
+@util.flask.cached(refreshif=lambda: util.flask.cache_check_headers() or "_refresh" in request.values, key=lambda: "view/%s/%s" % (request.path, g.locale))
+def localeJs(locale, domain):
+	from flask import _request_ctx_stack
+	from babel.messages.pofile import read_po
+
+	def messages_from_po(base_path, locale, domain):
+		path = os.path.join(base_path, locale)
+		if not os.path.isdir(path):
+			return dict(), None
+
+		path = os.path.join(path, "LC_MESSAGES", "{domain}.po".format(**locals()))
+		if not os.path.isfile(path):
+			return dict(), None
+
+		messages = dict()
+		with file(path) as f:
+			catalog = read_po(f, locale=locale, domain=domain)
+
+			for message in catalog:
+				message_id = message.id
+				if isinstance(message_id, (list, tuple)):
+					message_id = message_id[0]
+				messages[message_id] = message.string
+
+		return messages, catalog.plural_expr
+
+	messages = dict()
+
+	ctx = _request_ctx_stack.top
+	base_path = os.path.join(ctx.app.root_path, "translations")
+
+	plugins = octoprint.plugin.plugin_manager().enabled_plugins
+	for name, plugin in plugins.items():
+		base_path = os.path.join(plugin.location, 'translations')
+		plugin_messages, _ = messages_from_po(base_path, locale, domain)
+		messages = octoprint.util.dict_merge(messages, plugin_messages)
+
+	core_messages, plural_expr = messages_from_po(base_path, locale, domain)
+	messages = octoprint.util.dict_merge(messages, core_messages)
+
+	catalog = dict(
+		messages=messages,
+		plural_expr=plural_expr,
+		locale=locale,
+		domain=domain
+	)
+
+	return render_template("i18n.js.jinja2", catalog=catalog)
+
+
 @app.route("/plugin_assets/<string:name>/<path:filename>")
 def plugin_assets(name, filename):
 	asset_plugins = pluginManager.get_filtered_implementations(lambda p: p._identifier == name, octoprint.plugin.AssetPlugin)

src/octoprint/server/util/flask.py

@@ -48,6 +48,7 @@ def enable_plugin_translations():
 		translations = getattr(ctx, 'babel_translations', None)
 		if translations is None:
 			locale = flask.ext.babel.get_locale()
+			translations = support.Translations()
 
 			plugins = octoprint.plugin.plugin_manager().enabled_plugins
 			for name, plugin in plugins.items():
@@ -60,17 +61,11 @@ def enable_plugin_translations():
 				except:
 					logger.exception("Error while trying to load translations for plugin {name}".format(**locals()))
 				else:
-					if translations is None:
-						translations = plugin_translations
-					else:
-						translations = translations.merge(plugin_translations)
+					translations = translations.merge(plugin_translations)
 
 			dirname = os.path.join(ctx.app.root_path, 'translations')
 			core_translations = support.Translations.load(dirname, [locale])
-			if translations is None:
-				translations = core_translations
-			else:
-				translations = translations.merge(core_translations)
+			translations = translations.merge(core_translations)
 
 			ctx.babel_translations = translations
 		return translations

src/octoprint/templates/i18n.js.jinja2

@@ -0,0 +1 @@
+window.BABEL_TO_LOAD_{{ catalog.locale }} = {{ catalog | tojson | safe }};

src/octoprint/templates/javascripts.jinja2

@@ -40,12 +40,8 @@
 <script type="text/javascript" src="{{ url_for('static', filename='js/app/main.js') }}"></script>
 <!-- /Include OctoPrint files -->
 
-<!-- Include i18n language files -->
-{% if g.locale != 'en' %}
-    <script type="text/javascript" src="{{ url_for('static', filename='js/i18n/%s.js' % g.locale) }}"></script>
-{% endif %}
-<!-- /Include i18n language files -->
-
 <script type="text/javascript" src="{{ url_for('static', filename='gcodeviewer/js/ui.js') }}"></script>
 <script type="text/javascript" src="{{ url_for('static', filename='gcodeviewer/js/gCodeReader.js') }}"></script>
 <script type="text/javascript" src="{{ url_for('static', filename='gcodeviewer/js/renderer.js') }}"></script>
+
+<script type="text/javascript" src="{{ url_for('localeJs', locale=g.locale, domain='messages') }}"></script>