Update locale strings (#8914)

This PR updates the locale translation strings extracted from source
code.

## Triggered By
Commit: `527e071114a5e080313156367cfc177e9af2f775`
Message: Merge branch 'master' of https://github.com/ChurchCRM/CRM

## Changes
- Updated `locale/messages.po` with new/modified translatable strings
- Updated JSON locale keys

## Next Steps
- Review the new strings that need translation
- Merge this PR to update the base locale file
- Upload to POEditor for translation if needed

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

locale/messages.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2026-05-02 17:11+0000\n"
+"POT-Creation-Date: 2026-05-11 15:48+0000\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -6365,9 +6365,6 @@ msgstr ""
 msgid "MailChimp, backups, and more"
 msgstr ""
 
-msgid "Mailchimp"
-msgstr ""
-
 msgid "Mailchimp Connected"
 msgstr ""