Fix remaining Overleaf branding in email confirmation notifications

Replaces "Overleaf subscription"/"Overleaf Commons"/"Overleaf premium features"
with Verso equivalents in the institution subscription and commons upgrade
notification strings.

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

services/web/locales/en.json

@@ -1294,7 +1294,7 @@
   "institution_acct_successfully_linked_2": "Your <0>__appName__</0> account was successfully linked to your <0>__institutionName__</0> institutional account.",
   "institution_and_role": "Institution and role",
   "institution_email_new_to_app": "Your <b>__institutionName__</b> email (<b>__email__</b>) is new to __appName__.",
-  "institution_has_overleaf_subscription": "<0>__institutionName__</0> has an Overleaf subscription. Click the confirmation link sent to __emailAddress__ to upgrade to <0>Overleaf Commons</0>.",
+  "institution_has_overleaf_subscription": "<0>__institutionName__</0> has a Verso subscription. Click the confirmation link sent to __emailAddress__ to upgrade to <0>Verso Commons</0>.",
   "institution_templates": "Institution Templates",
   "institutional": "Institutional",
   "institutional_login_unknown": "Sorry, we don’t know which institution issued that email address. You can browse our <a href=\"__link__\">list of institutions</a> to find yours, or you can use one of the other options below.",
@@ -1773,7 +1773,7 @@
   "one_collaborator_per_project": "1 collaborator per project",
   "one_free_collab": "One free collaborator",
   "one_per_project": "1 per project",
-  "one_step_away_from_professional_features": "You are one step away from accessing <0>Overleaf premium features</0>!",
+  "one_step_away_from_professional_features": "You are one step away from accessing <0>Verso premium features</0>!",
   "ongoing_experiments": "Ongoing experiments",
   "online_latex_editor": "Online LaTeX Editor",
   "only_add_people_who_dont_yet_have_access": "Only add people who don’t yet have access.",