IMAGEADJUST: Image Adjust dialog for raster images

IMAGEADJUST (alias IAD) takes the selected raster images or asks
"Select image(s):", then opens a dialog with a before/after preview of
the first image and brightness, contrast and fade rows (bar plus
stepper, whole numbers 0-100). Apply writes the values to every chosen
image as one undo step; restore defaults sets 50/50/0. Adds the
image_adjust automation action and the image-adjust locale group.

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

locales/ru-RU/opencadstudio.ftl

@@ -6490,3 +6490,18 @@ ref-edit =
     .redefined = __ocs_fmt_0__ переопределен.
     .ok = Ок
     .nested = Вложенные
+
+image-adjust =
+    .title = Image Adjust
+    .preview = Preview
+    .before = Before
+    .after = After
+    .no-preview = image could not be loaded
+    .adjust = Adjust
+    .brightness = Brightness
+    .contrast = Contrast
+    .fade = Fade
+    .hint = Click or drag a bar; − / + is one step, a box takes a whole number 0–100.
+    .reset = Restore defaults
+    .apply = Apply
+    .help = Sets the brightness, contrast and fade of the selected raster images.