IMPORT: 3D Studio files

A .3ds file opens the 3D Studio Import window: the file's objects with
their kind and material count, filtered by kind or name, checked one by
one or all at once, where to put them on layers and what a mesh with
several materials becomes. Checked meshes come in as polyface meshes on
the chosen layers with materials made from the file's colours, cameras
as named views; a mesh with several materials is split, given its first
material, given none, or asked about on the command line. Automation
drives the window with tds_import_dialog.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locales/ru-RU/opencadstudio.ftl

@@ -6676,6 +6676,41 @@ dgn-import =
     .help-import = Imports a file of the chosen format with the format's importer.
     .blank = Filename cannot be blank
     .invalid-dgn = Invalid or unsupported DGN file.
+import-3ds =
+    .title = 3D Studio Import
+    .summary = { $objects } objects, { $materials } materials
+    .change = Change...
+    .mesh = Mesh
+    .light = Light
+    .camera = Camera
+    .general = General
+    .global = Global Settings
+    .all = All
+    .name = Name
+    .type = Type
+    .materials = { $n } materials
+    .objects = Objects
+    .search = Search by name...
+    .select-all = Select all
+    .clear = Clear
+    .layers = Place on layers
+    .by-object = By object
+    .by-material = By material
+    .by-color = By object color
+    .single = Single layer
+    .note-object = Each object goes on a layer named after it.
+    .note-material = Each object goes on a layer named after its material.
+    .note-color = Each object goes on a layer named after its color.
+    .note-single = Every object goes on one layer.
+    .multi = Objects with several materials
+    .ask = Ask each time
+    .split = Split by material
+    .first = Assign the first material
+    .none = Don't assign a material
+    .reason = Check at least one object
+    .cancel = Cancel
+    .import = Import
+    .help = Imports the checked objects of a 3D Studio file: meshes as polyface meshes with their materials, cameras as named views.
 import-panel =
     .dgn-import = Импорт DGN
     .recognize-shx = Распознать текст SHX