Fix translation keys and remove sidebar logo border

- extracted-translations.json: add n_projects_selected, n_projects_selected_plural,
  deselect_all — the translations-loader.js only bundles keys present in this file,
  which is why the FR translations were silently stripped from the webpack chunk
- Revert lang.default workaround in i18n.ts (not needed)
- SCSS: remove border-top above .ds-nav-verso-logo in sidebar

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/web/frontend/extracted-translations.json

@@ -77,8 +77,8 @@
   "add_another_address_line": "",
   "add_another_email": "",
   "add_another_token": "",
-  "add_comma_separated_emails_help": "",
   "add_collaborators": "",
+  "add_comma_separated_emails_help": "",
   "add_comment": "",
   "add_comment_error_message": "",
   "add_comment_error_title": "",
@@ -471,6 +471,7 @@
   "demonstrating_track_changes_feature": "",
   "department": "",
   "description": "",
+  "deselect_all": "",
   "details": "",
   "details_provided_by_google_explanation": "",
   "dictionary": "",
@@ -1266,6 +1267,8 @@
   "n_more_updates_above_plural": "",
   "n_more_updates_below": "",
   "n_more_updates_below_plural": "",
+  "n_projects_selected": "",
+  "n_projects_selected_plural": "",
   "name": "",
   "name_usage_explanation": "",
   "navigation": "",
@@ -1466,8 +1469,6 @@
   "please_ask_the_project_owner_to_upgrade_to_track_changes": "",
   "please_change_primary_to_remove": "",
   "please_compile_pdf_before_download": "",
-  "python_packages": "",
-  "python_packages_help": "",
   "please_confirm_primary_email_or_edit": "",
   "please_confirm_secondary_email_or_edit": "",
   "please_confirm_your_email_before_making_it_default": "",
@@ -1502,14 +1503,14 @@
   "premium_plan_label": "",
   "preparing_for_export": "",
   "preparing_your_download": "",
+  "present": "",
+  "present_publishes_and_opens_in_new_tab": "",
   "presentation_export_can_take_a_moment": "",
   "presentation_export_failed": "",
   "presentation_link_members": "",
   "presentation_link_private": "",
   "presentation_link_public": "",
   "presentation_mode": "",
-  "present": "",
-  "present_publishes_and_opens_in_new_tab": "",
   "press_shift_space_for_suggestions": "",
   "press_space_to_open_the_ai_assistant": "",
   "preview": "",
@@ -1582,6 +1583,8 @@
   "pull_github_changes_into_sharelatex": "",
   "push_sharelatex_changes_to_github": "",
   "push_to_github_pull_to_overleaf": "",
+  "python_packages": "",
+  "python_packages_help": "",
   "quoted_text": "",
   "raw_logs": "",
   "raw_logs_description": "",

services/web/frontend/js/i18n.ts

@@ -57,10 +57,7 @@ i18n.use(initReactI18next).init({
 const localesPromise = import(
   /* webpackChunkName: "[request]" */ `../../locales/${LANG}.json`
 ).then(lang => {
-  // webpack dynamic JSON imports return a module object { default: JSON },
-  // not the raw JSON — unwrap if needed.
-  const data = lang.default ?? lang
-  i18n.addResourceBundle(LANG, 'translation', data)
+  i18n.addResourceBundle(LANG, 'translation', lang)
   i18n.addResourceBundle(
     LANG,
     'writefull',

services/web/frontend/stylesheets/pages/project-list-lumiere.scss

@@ -198,7 +198,7 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
   // ══════════════════════════════════════════════════════════════════════════
 
   .ds-nav-sidebar-lower {
-    border-top-color: $lum-border !important;
+    border-top: none !important;
     padding-top: 0.75rem;
   }