[FIX] web,http_routing: correctly invalidate cache translation

cache_hashes was introduced at 8a28cc22fd to reduce the number of reload
The cache is correctly reseted when the translations content changed but did
not contain all the translation-related parameters that are, however, stored
in the session_info

This commit fixes two bugs:

Language parameters invalidation:
1. Access the webclient in a specific language
2. Modify the language parameters (e.g. thousands separator)
3. Refresh the page
--> webclient is still using old language parameters (from cache)

No translation flag after installing a language:
1. Load a database in English in mono-language
2. Load a second language
3. Access a record with a translated field
--> translation button not present on translated field (multi_lang is still
false in cache value)

To fix it, this commit adds all the information that are returns by the
/web/webclient/translations call to make sure the hash represent the reality

closes odoo/odoo#34266

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/http_routing/models/ir_http.py

@@ -246,12 +246,17 @@ class IrHttp(models.AbstractModel):
         modules = IrHttpModel.get_translation_frontend_modules()
         user_context = request.session.get_context() if request.session.uid else {}
         lang = user_context.get('lang')
-        translations, _ = request.env['ir.translation'].get_translations_for_webclient(modules, lang)
+        translations, lang_params = request.env['ir.translation'].get_translations_for_webclient(modules, lang)
+        translation_cache = {
+            'lang_parameters': lang_params,
+            'modules': translations,
+            'multi_lang': len(request.env['res.lang'].sudo().get_installed()) > 1,
+        }
 
         session_info.update({
             'translationURL': '/website/translations/',
             'cache_hashes': {
-                'translations': hashlib.sha1(json.dumps(translations, sort_keys=True).encode()).hexdigest(),
+                'translations': hashlib.sha1(json.dumps(translation_cache, sort_keys=True).encode()).hexdigest(),
             },
         })
         return session_info

addons/web/models/ir_http.py

@@ -32,10 +32,15 @@ class Http(models.AbstractModel):
         _, qweb_checksum = concat_xml(files)
 
         lang = user_context.get("lang")
-        translations_per_module, _ = request.env['ir.translation'].get_translations_for_webclient(mods, lang)
+        translations_per_module, lang_params = request.env['ir.translation'].get_translations_for_webclient(mods, lang)
+        translation_cache = {
+            'lang_parameters': lang_params,
+            'modules': translations_per_module,
+            'multi_lang': len(request.env['res.lang'].sudo().get_installed()) > 1,
+        }
 
         menu_json_utf8 = json.dumps(request.env['ir.ui.menu'].load_menus(request.session.debug), default=ustr, sort_keys=True).encode()
-        translations_json_utf8 = json.dumps(translations_per_module,  sort_keys=True).encode()
+        translations_json_utf8 = json.dumps(translation_cache,  sort_keys=True).encode()
 
         return {
             "uid": request.session.uid,