Add trial activation details in English and Russian localization

- Introduced a new message for trial activation details, providing users with information about the duration, validity, and configuration link.
- Enhanced user experience by ensuring clarity and consistency in both English and Russian locales.

locales/en.json

@@ -51,6 +51,7 @@
   "trial_already_had_subscription_or_trial": "You have already used a free trial or had a paid subscription. Free trial is available only once for new users.",
   "trial_confirm_activate_button": "✅ Activate!",
   "trial_activated_alert": "Trial activated!",
+  "trial_activated_details_message": "🚀 Your {days}-day free trial is activated!\n\nValid until: <b>{end_date}</b>\nTraffic: <b>{traffic_gb} GB</b>\n\nYour configuration link:\n<code>{config_link}</code>",
   "yes_button": "Yes",
   "no_button": "No",
   "referral_program_info_new": "🎁 <b>Referral Program</b>\n\n📊 <b>Your stats:</b>\n👥 Friends invited: <b>{invited_count}</b>\n💳 Purchased subscription: <b>{purchased_count}</b>\n\n🔗 Your link:\n<code>{referral_link}</code>\n\n💰 <b>Invitation bonuses:</b>\n{bonus_details}\n\n📢 Share the link with friends and get bonuses!",