Implement version 0.0.8 features

- Remove Current Version field from product license settings
- Derive current version from latest product version in database
- Refactor email system to use WooCommerce email notification classes
- Add LicenseExpirationEmail WC_Email class for expiration warnings
- Add customizable email templates (HTML and plain text)
- Update settings to link to WooCommerce email configuration
- Update translations for new email-related strings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

languages/wc-licensed-product.pot

@@ -2,7 +2,7 @@
 # This file is distributed under the GPL-2.0-or-later.
 msgid ""
 msgstr ""
-"Project-Id-Version: WC Licensed Product 0.0.7\n"
+"Project-Id-Version: WC Licensed Product 0.0.8\n"
 "Report-Msgid-Bugs-To: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/issues\n"
 "POT-Creation-Date: 2026-01-21T00:00:00+00:00\n"
 "MIME-Version: 1.0\n"
@@ -60,12 +60,6 @@ msgstr ""
 msgid "If enabled, licenses are bound to the major version at purchase time by default."
 msgstr ""
 
-msgid "Current Version"
-msgstr ""
-
-msgid "Current software version (e.g., 1.0.0)"
-msgstr ""
-
 #. Global settings
 msgid "Default License Settings"
 msgstr ""
@@ -815,3 +809,59 @@ msgstr ""
 
 msgid "No"
 msgstr ""
+
+#. Email settings
+msgid "Expiration Warning Schedule"
+msgstr ""
+
+msgid "Configure when expiration warning emails are sent. To customize the email template, enable/disable, or change the subject, go to %s."
+msgstr ""
+
+msgid "WooCommerce > Settings > Emails > License Expiration Warning"
+msgstr ""
+
+msgid "First Warning (Days Before)"
+msgstr ""
+
+msgid "Days before expiration to send the first warning email."
+msgstr ""
+
+msgid "Second Warning (Days Before)"
+msgstr ""
+
+msgid "Days before expiration to send the second warning email. Set to 0 to disable."
+msgstr ""
+
+#. WooCommerce Email Class
+msgid "License Expiration Warning"
+msgstr ""
+
+msgid "License expiration warning emails are sent to customers when their licenses are about to expire."
+msgstr ""
+
+msgid "[{site_title}] Your license for {product_name} expires in {days_remaining} days"
+msgstr ""
+
+msgid "Available placeholders: %s"
+msgstr ""
+
+msgid "Enable this email notification"
+msgstr ""
+
+msgid "Email heading"
+msgstr ""
+
+msgid "Additional content"
+msgstr ""
+
+msgid "Text to appear below the main email content."
+msgstr ""
+
+msgid "Email type"
+msgstr ""
+
+msgid "Choose which format of email to send."
+msgstr ""
+
+msgid "Customer"
+msgstr ""