I18n: Disambiguate "Meta" in the context of NLA's meta strips

Use the "Action" context for this, if in any language it's different
from a sequencer meta strip, which already uses "Sequence".

Reported by Ye Gui in #43295.

source/blender/blenkernel/intern/nla.cc

@@ -1932,7 +1932,7 @@ void BKE_nlastrip_validate_name(AnimData *adt, NlaStrip *strip)
         STRNCPY_UTF8(strip->name, DATA_("Transition"));
         break;
       case NLASTRIP_TYPE_META: /* meta */
-        STRNCPY_UTF8(strip->name, DATA_("Meta"));
+        STRNCPY_UTF8(strip->name, CTX_DATA_(BLT_I18NCONTEXT_ID_ACTION, "Meta"));
         break;
       default:
         STRNCPY_UTF8(strip->name, DATA_("NLA Strip"));

source/blender/makesrna/intern/rna_nla.cc

@@ -14,6 +14,8 @@
 #include "ANIM_action.hh"
 #include "ANIM_nla.hh"
 
+#include "BLT_translation.hh"
+
 #include "RNA_define.hh"
 #include "RNA_enum_types.hh"
 
@@ -787,6 +789,7 @@ static void rna_def_nlastrip(BlenderRNA *brna)
   RNA_def_property_clear_flag(
       prop, PROP_EDITABLE); /* XXX for now, not editable, since this is dangerous */
   RNA_def_property_enum_items(prop, prop_type_items);
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_ACTION);
   RNA_def_property_ui_text(prop, "Type", "Type of NLA Strip");
   RNA_def_property_update(prop, NC_ANIMATION | ND_NLA | NA_EDITED, "rna_NlaStrip_update");