Update I18n process with liaison

- Clarify that string freezes are applied to I18n target projects
- Fix I18n PTL to I18n SIG per governance change
- Update release liaison for I18n

Change-Id: If256992882a50bebabc3d4873d8512f0f155fc1e

data/release_liaisons.yaml

@@ -37,9 +37,9 @@ horizon:
     irc: vishalmanchanda
     email: manchandavishal143@gmail.com
 I18n:
-  - name: 'Frank Kloeker'
-    irc: eumel8
-    email: f.kloeker@telekom.de
+  - name: 'Ian Y. Choi'
+    irc: ianychoi
+    email: ianyrchoi@gmail.com
 ironic:
   - name: 'Iury Gregory Melo Ferreira'
     irc: iurygregory

doc/source/reference/process.rst

@@ -973,7 +973,10 @@ R-5 week (Milestone-3)
    by the proposal bot, but do approve changes for new OpenStack deliverable
    releases.
 
-#. At the end of the week, send weekly email content for R-4 week::
+#. At the end of the week, send weekly email content for R-4 week.
+
+   Note: String freezes are applied to `I18n team target projects <https://translate.openstack.org/>`_
+   and with ``cycle-with-rc`` or ``cycle-with-intermediary`` release model::
 
     Development Focus
     -----------------
@@ -1362,7 +1365,7 @@ R-2 week
         master->master instead of previous->master. At the end of Ocata
         this caused trouble for the Ironic team, for example.
 
-   - Remind the I18n PTL to update the translation tools for the new stable
+   - Remind the I18n SIG lead to update the translation tools for the new stable
      series.
 
    - If the previous list is empty then we can remind the requirements