add yaml files for BCC templates

include/i18n/en_US/templates/email/ticket.activity.notice.bcc.yaml

+#
+# Email template: ticket.activity.notice.bcc.yaml
+#
+# Notice sent to BCCd collaborators on ticket activity e.g reply or message
+#
+---
+notes: |
+    Notice sent to BCCd collaborators on ticket activity e.g reply or message.
+
+subject: |
+    Re: %{ticket.subject} [#%{ticket.number}]
+body: |
+    <h3><strong>Dear %{recipient.name.first},</strong></h3>
+    <div>
+        <em>%{poster.name}</em> just logged a message to a ticket in which you participate.
+    </div>
+    <br>
+    %{message}
+    <br>
+    <br>
+    Ticket recipients can be seen below where the User is first and any other
+    names are ticket Collaborators.
+    <br>
+    <br>
+    Recipients:
+    <br>
+    %{ticket.recipients}
+    <br>
+    <br>
+    <hr>
+    <div style="color: rgb(127, 127, 127); font-size: small; text-align: center;">
+    <em>You're getting this email because you have been BCC'd
+    on ticket <a href="%{recipient.ticket_link}" style="color: rgb(84, 141, 212);"
+    >#%{ticket.number}</a> This means that only agents can see your responses to
+    this ticket. To participate, simply reply to this email
+    or <a href="%{recipient.ticket_link}" style="color: rgb(84, 141, 212);"
+    >click here</a> for a complete archive of the ticket thread.</em>
+    </div>

include/i18n/en_US/templates/email/ticket.notice.bcc.yaml

+#
+# Email template: ticket.notice.bcc.yaml
+#
+# Sent to a BCC'd user when a staff member creates a ticket on another user's behalf.
+#
+---
+notes: |
+    Sent to a BCC'd user when a staff member creates a ticket on another user's behalf.
+
+subject: |
+    %{ticket.subject} [#%{ticket.number}]
+body: |
+    <h3><strong>Dear %{recipient.name.first},</strong></h3>
+    Our customer care team has created a ticket, <a
+    href="%{recipient.ticket_link}">#%{ticket.number}</a> on behalf of %{ticket.name}, with
+    the following details and summary:
+    <br>
+    <br>
+    Topic: <strong>%{ticket.topic.name}</strong>
+    <br>
+    Subject: <strong>%{ticket.subject}</strong>
+    <br>
+    <br>
+    %{message}
+    <br>
+    <br>
+    You have been BCC'd on this ticket. This means that only agents can see your
+    responses to this ticket.
+    <br>
+    <br>
+    You can <a href="%{recipient.ticket_link}">view this
+    ticket's progress online</a>.
+    <br>
+    <br>
+    Ticket recipients can be seen below where the User is first and any other
+    names are ticket Collaborators.
+    <br>
+    <br>
+    Recipients:
+    <br>
+    %{ticket.recipients}
+    <br>
+    <br>
+    <div style="color: rgb(127, 127, 127);">
+    Your %{company.name} Team,<br>
+    %{signature}</div>
+    <hr>
+    <div style="color: rgb(127, 127, 127); font-size: small; "><em>If you
+    wish to provide additional comments or information regarding the issue,
+    please reply to this email or <a href="%{recipient.ticket_link}"><span
+    style="color: rgb(84, 141, 212);" >login to your account</span></a> for
+    a complete archive of your support requests.</em></div>

include/i18n/en_US/templates/email/ticket.reply.bcc.yaml

+#
+# Email template: ticket.reply.bcc.yaml
+#
+# Sent to BCC'd collaborators when a staff member makes a reply to a ticket.
+# Replies are only generated by staff members.
+#
+---
+notes: |
+    Sent to BCC'd collaborators when a staff member makes a reply to their ticket.
+    Replies are only generated by staff members.
+
+subject: |
+    Re: %{ticket.subject} [#%{ticket.number}]
+body: |
+    <h3><strong>Dear %{recipient.name.first},</strong></h3>
+    %{response}
+    <br>
+    <br>
+    Ticket recipients can be seen below where the User is first and any other
+    names are ticket Collaborators.
+    <br>
+    <br>
+    Recipients:
+    <br>
+    %{ticket.recipients}
+    <br>
+    <br>
+    <div style="color: rgb(127, 127, 127);">
+    Your %{company.name} Team,<br>
+    %{signature}
+    </div>
+    <hr>
+    <div style="color: rgb(127, 127, 127); font-size: small; text-align: center;"
+    ><em>You are receiving this message because you have been BCC'd on a ticket.
+    This means that only agents can see your responses to this ticket.
+    To participate in this ticket, please reply to this email or
+    <a href="%{recipient.ticket_link}" style="color: rgb(84, 141, 212);" >login
+    to your account</a> for a complete archive of all your support requests
+    and responses.</em></div>