Manually merged fixes from seve12.

Thanks to seve12 !

Related https://github.com/wekan/wekan/pull/5967

client/components/rules/actions/boardActions.jade

@@ -24,6 +24,7 @@ template(name="boardActions")
         | {{_'r-the-board'}}
       div.trigger-dropdown
         select(id="board-id")
+          option(value="" disabled selected if=not boards.length) {{loadingBoardsLabel}}
           each boards
             if $eq _id currentBoard._id
               option(value="{{_id}}" selected) {{_ 'current'}}
@@ -85,6 +86,7 @@ template(name="boardActions")
         | {{_'r-the-board'}}
       div.trigger-dropdown
         select(id="board-id-link")
+          option(value="" disabled selected if=not boards.length) {{loadingBoardsLabel}}
           each boards
             if $eq _id currentBoard._id
               option(value="{{_id}}" selected) {{_ 'current'}}

client/components/rules/actions/boardActions.js

@@ -1,7 +1,11 @@
 import { ReactiveCache } from '/imports/reactiveCache';
+import { TAPi18n } from '/imports/i18n';
 
 BlazeComponent.extendComponent({
-  onCreated() {},
+  onCreated() {
+    // Ensure boards are available for action dropdowns
+    this.subscribe('boards');
+  },
 
   boards() {
     const ret = ReactiveCache.getBoards(
@@ -19,6 +23,16 @@ BlazeComponent.extendComponent({
     return ret;
   },
 
+  loadingBoardsLabel() {
+    try {
+      const txt = TAPi18n.__('loading-boards');
+      if (txt && !txt.startsWith("key '")) return txt;
+    } catch (e) {
+      // ignore translation lookup errors
+    }
+    return 'Loading boards...';
+  },
+
   events() {
     return [
       {

client/components/rules/ruleDetails.js

@@ -5,6 +5,7 @@ BlazeComponent.extendComponent({
     this.subscribe('allRules');
     this.subscribe('allTriggers');
     this.subscribe('allActions');
+    this.subscribe('boards');
   },
 
   trigger() {

client/components/rules/rulesActions.jade

@@ -1,7 +1,9 @@
 template(name="rulesActions")
   h2
     | ✨
-    | {{_ 'r-rule' }} "#{data.ruleName.get}" - {{_ 'r-add-action'}}
+    | {{_ 'r-rule' }} "
+    = ruleName.get()
+    | " - {{_ 'r-add-action'}}
   .triggers-content
     .triggers-body
       .triggers-side-menu

client/components/rules/rulesTriggers.jade

@@ -1,7 +1,9 @@
 template(name="rulesTriggers")
   h2
     | ✨
-    | {{_ 'r-rule' }} "#{data.ruleName.get}" - {{_ 'r-add-trigger'}}
+    | {{_ 'r-rule' }} "
+    = ruleName.get()
+    | " - {{_ 'r-add-trigger'}}
   .triggers-content
     .triggers-body
       .triggers-side-menu