Replace tx node label with proposal in jobs.

Use the proposal node label in place of the old tx node label. The new
proposal.slave host has both labels for the time being, but should
remove 'tx' in the future.

Change-Id: I1899348f0beaaeffcc192b51f90274458b7d3323

modules/openstack_project/files/jenkins_job_builder/config/translation-jobs.yaml

@@ -11,7 +11,7 @@
     publishers:
       - console-log
 
-    node: 'tx'
+    node: 'proposal'
 
 - job-template:
     name: '{name}-propose-translation-update'
@@ -31,7 +31,7 @@
           branches:
             - 'origin/master'
 
-    node: 'tx'
+    node: 'proposal'
 
 - job:
     name: manuals-upstream-translation-update
@@ -46,7 +46,7 @@
     publishers:
       - console-log
 
-    node: 'tx'
+    node: 'proposal'
 
 - job:
     name: manuals-propose-translation-update
@@ -66,7 +66,7 @@
           branches:
             - 'origin/master'
 
-    node: 'tx'
+    node: 'proposal'
 
 - job-group:
     name: translation-jobs