fix: populate TextTemplate translation defaults + Editable=Always on filters

Refs: mendixlabs#541

Two further CE0463 gaps closed:

1. TextTemplate translation defaults (4 templates: combobox.json + 3
   datagrid filters). Widget XML <translations> elements on textTemplate
   properties (e.g. DatagridTextFilter's screenReaderInputCaption with
   en_US='Search', de_DE='Suche', nl_NL='Zoeken') become defaults that
   Studio Pro copies into the WidgetObject's Forms$ClientTemplate
   Template.Items at widget instantiation time.

   Previously: the embedded templates carried these translations only on
   the PropertyType's ValueType.Translations (the type-level definition),
   but the WidgetObject's WidgetValue.TextTemplate.Template.Items was
   empty. So mxcli emitted textfilters with no translation defaults,
   triggering CE0463.

   Fix: bulk-populated WidgetObject.Properties[].Value.TextTemplate.
   Template.Items from PropertyType.ValueType.Translations for every
   textTemplate property in every embedded template. 4 entries added
   across 4 files.

2. Filter widget Editable override (datagrid_builder.go line 87). The
   wrapper pages.CustomWidget struct explicitly set Editable="Inherited"
   even though buildFilterWidgetBSON wrote "Always" into the inner BSON.
   The struct value wins at serialization time, so the final BSON ended
   up "Inherited" — mismatch with Studio Pro's "Always" for filter
   widgets inside DataGrid columns. Fixed.

Verification: focused textFilter1 diff (PgTest.DataGridExample vs mxcli
recreation in same project, UUID-normalized): was 71 lines, now 0 lines.
The textfilter widget BSON is now byte-identical to a Studio-Pro-emitted
textfilter for the same MDL input.

CE0463 status: still firing on parent DataGrid widgets. Diff at the
DataGrid-WidgetObject level (excluding columns property) shows 72
remaining lines — Studio Pro populates additional TextTemplate values
(`Microflows$TextTemplate`, populated Template.Items arrays) and one
boolean value (true vs false) on properties the mxcli output leaves
default/null. Closing these requires either runtime population of more
default values from PropertyType.ValueType, or further targeted
embedded-template patching. Tracked under mendixlabs#541 for follow-up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ako

mdl/backend/mpr/datagrid_builder.go

@@ -84,7 +84,7 @@ func (b *MprBackend) BuildFilterWidget(spec backend.FilterWidgetSpec, projectPat
 			},
 			Name: spec.FilterName,
 		},
-		Editable:  "Inherited",
+		Editable:  "Always",
 		RawObject: getBsonField(bsonD, "Object"),
 		RawType:   getBsonField(bsonD, "Type"),
 	}

sdk/widgets/templates/mendix-11.6/combobox.json

@@ -1206,7 +1206,19 @@
               "$ID": "e3f4a5b6c7d8e9f0a1b2c3d4e5f60102",
               "$Type": "Texts$Text",
               "Items": [
-                3
+                3.0,
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "en_US",
+                  "Text": "Select all"
+                },
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "nl_NL",
+                  "Text": "Selecteer alles"
+                }
               ]
             }
           },

sdk/widgets/templates/mendix-11.6/datagrid-dropdown-filter.json

@@ -2156,7 +2156,19 @@
               "$ID": "5839c2234c144b4995fcd9df68928e35",
               "$Type": "Texts$Text",
               "Items": [
-                3
+                3.0,
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "en_US",
+                  "Text": "None"
+                },
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "nl_NL",
+                  "Text": "Niets"
+                }
               ]
             }
           },

sdk/widgets/templates/mendix-11.6/datagrid-number-filter.json

@@ -469,7 +469,27 @@
             "Template": {
               "$ID": "dd2b3c4d5e6f700300000000000003a2",
               "$Type": "Texts$Text",
-              "Items": []
+              "Items": [
+                3.0,
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "en_US",
+                  "Text": "Search"
+                },
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "de_DE",
+                  "Text": "Suche"
+                },
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "nl_NL",
+                  "Text": "Zoeken"
+                }
+              ]
             }
           },
           "TranslatableValue": null,

sdk/widgets/templates/mendix-11.6/datagrid-text-filter.json

@@ -1284,7 +1284,25 @@
               "$ID": "25e5dd1c08c8cd40b843741894ad3950",
               "$Type": "Texts$Text",
               "Items": [
-                3
+                3.0,
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "en_US",
+                  "Text": "Search"
+                },
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "de_DE",
+                  "Text": "Suche"
+                },
+                {
+                  "$ID": "00000000000000000000000000000000",
+                  "$Type": "Texts$Translation",
+                  "LanguageCode": "nl_NL",
+                  "Text": "Zoeken"
+                }
               ]
             }
           },