Update locale strings (#7797)

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

## Triggered By
Commit: `c3c953bb5a08d4e190021e71fc9691a46b3b876c`
Message: Fix undefined error message in demo import API response (#7792)

The demo data import API returned `{error: "..."}` while the error
handler expected `{message: "..."}`, causing "Error text: undefined" to
display in the alert dialog.

## Changes

**API Response Standardization** (`demo.php`)
- Changed error field from `error` to `message` in both 403 and 500
responses
- Aligns with existing admin API pattern (upgrade.php,
orphaned-files.php)

**Error Handler Resilience** (`CRMJSOM.js`)
```javascript
// Before
let message = "..." + error.message;

// After - handles message, error, or msg fields
var errorText = error.message || error.error || error.msg || i18next.t("Unknown error");
let message = "..." + errorText;
```

**Import Handler Update** (`importDemoData.js`)
- Updated to expect `message` field from API responses in both
success/failure branches

**Test Coverage** (`admin.system-demo.spec.js`)
- Added validation that API returns `message` field (not `error`) with
403 status

> [!WARNING]
>
> <details>
> <summary>Firewall rules blocked me from connecting to one or more
addresses (expand for details)</summary>
>
> #### I tried to connect to the following addresses, but was blocked by
firewall rules:
>
> - `download.cypress.io`
> - Triggering command: `/usr/local/bin/node node dist/index.js --exec
install` (dns block)
>
> If you need me to access, download, or install something from one of
these locations, you can either:
>
> - Configure [Actions setup
steps](https://gh.io/copilot/actions-setup-steps) to set up my
environment, which run before the firewall is enabled
> - Add the appropriate URLs or hosts to the custom allowlist in this
repository's [Copilot coding agent

settings](https://github.com/ChurchCRM/CRM/settings/copilot/coding_agent)
(admins only)
>
> </details>

<!-- START COPILOT ORIGINAL PROMPT -->



<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>Alert shows error text undefined</issue_title>
> <issue_description>**Describe the issue** 
> 
> Canceling Import returns error message that is not visale 
> 
> <img width="2494" height="612" alt="Image"

src="https://github.com/user-attachments/assets/fa30fe2a-bddd-46ab-abc8-f19724b0401f"
/>
> 
> API
https://demos6.softaculous.com/ChurchCRMc2nve1aweo/admin/api/demo/load
> returns 
> {
>     "success": false,
> "error": "Demo data import is only available on fresh installations
with exactly 1 person"
> }
> 
> but alert shows error text undefined 
> 
> 
> Collected Value Title |  Data 
> ----------------------|----------------
> Page Name |/ChurchCRMc2nve1aweo/admin/
> Screen Size |1440x5120
> Window Size |1189x2319
> Page Size |1189x2319
> Platform Information | Linux s2-demos.softaculous.com
5.14.0-570.37.1.el9_6.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Aug
26 10:33:12 EDT 2025 x86_64
> PHP Version | 8.3.27
> SQL Version | 8.0.44
> ChurchCRM Version |6.5.3
> Reporting Browser |Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
> Prerequisite Status |All Prerequisites met
> </issue_description>
> 
> <agent_instructions>ensure that the we look for the repsonse payload
for "error" for text, or ensure all APIs use the same standard respose
body format </agent_instructions>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>



<!-- START COPILOT CODING AGENT SUFFIX -->

- Fixes #7791

<!-- START COPILOT CODING AGENT TIPS -->
---

💬 We'd love your input! Share your thoughts on Copilot coding agent in
our [2 minute survey](https://gh.io/copilot-coding-agent-survey).

## 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

Author: DawoudIO

locale/messages.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-12-13 19:47-0800\n"
+"POT-Creation-Date: 2025-12-17 07:34+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"
@@ -641,6 +641,9 @@ msgstr ""
 msgid "An error occurred during demo data import"
 msgstr ""
 
+msgid "An error occurred. Please contact your system administrator."
+msgstr ""
+
 msgid "An error occurred: "
 msgstr ""
 
@@ -927,6 +930,9 @@ msgstr ""
 msgid "Backup downloaded. Server copy removed."
 msgstr ""
 
+msgid "Backup failed"
+msgstr ""
+
 msgid "Backup failed. Please try again."
 msgstr ""
 
@@ -1910,7 +1916,10 @@ msgstr ""
 msgid "Database name is required"
 msgstr ""
 
-msgid "Database reset failed: "
+msgid "Database reset failed"
+msgstr ""
+
+msgid "Database restore failed"
 msgstr ""
 
 msgid "Database schema upgraded automatically"
@@ -2107,9 +2116,18 @@ msgstr ""
 msgid "Demo Data"
 msgstr ""
 
+msgid "Demo data import failed"
+msgstr ""
+
+msgid "Demo data import is only available on fresh installations with exactly 1 person"
+msgstr ""
+
 msgid "Demo data imported successfully"
 msgstr ""
 
+msgid "Demo data loaded successfully"
+msgstr ""
+
 #. Context: countries
 msgid "Denmark (Danmark)"
 msgstr ""
@@ -2307,6 +2325,9 @@ msgstr ""
 msgid "Download and Apply System Update"
 msgstr ""
 
+msgid "Download failed"
+msgstr ""
+
 msgid "Download family letters"
 msgstr ""
 
@@ -2844,6 +2865,9 @@ msgstr ""
 msgid "Failed to add to cart"
 msgstr ""
 
+msgid "Failed to apply upgrade"
+msgstr ""
+
 msgid "Failed to copy URL"
 msgstr ""
 
@@ -2853,9 +2877,15 @@ msgstr ""
 msgid "Failed to create group. Please try again."
 msgstr ""
 
+msgid "Failed to delete orphaned files"
+msgstr ""
+
 msgid "Failed to delete role. Please try again."
 msgstr ""
 
+msgid "Failed to download latest release"
+msgstr ""
+
 msgid "Failed to download update package."
 msgstr ""
 
@@ -2874,6 +2904,9 @@ msgstr ""
 msgid "Failed to load groups. Please refresh the page."
 msgstr ""
 
+msgid "Failed to refresh upgrade information"
+msgstr ""
+
 msgid "Failed to refresh upgrade information from GitHub."
 msgstr ""
 
@@ -2907,6 +2940,12 @@ msgstr ""
 msgid "Failed to update role name. Please try again."
 msgstr ""
 
+msgid "Failed to upload family photo"
+msgstr ""
+
+msgid "Failed to upload person photo"
+msgstr ""
+
 #. Context: countries
 msgid "Falkland Islands (Islas Malvinas)"
 msgstr ""
@@ -6161,6 +6200,9 @@ msgstr ""
 msgid "Remote Backup Username"
 msgstr ""
 
+msgid "Remote backup failed"
+msgstr ""
+
 msgid "Remove"
 msgstr ""
 
@@ -7036,9 +7078,6 @@ msgstr ""
 msgid "St. Vincent & Grenadines"
 msgstr ""
 
-msgid "Stack Trace"
-msgstr ""
-
 msgid "Standard Info"
 msgstr ""
 
@@ -8254,6 +8293,9 @@ msgstr ""
 msgid "WebDAV"
 msgstr ""
 
+msgid "WebDAV backups are not correctly configured. Please ensure endpoint, username, and password are set"
+msgstr ""
+
 msgid "Wedding"
 msgstr ""