Select Color: Document and Color books tabs

Document tab: every concrete colour the drawing uses (objects, block
definitions and layers), found in one pass when the panel opens, as a
grid of swatches sortable by recently used, most used, colour and colour
number. The recently-used list is now kept per drawing, so the ribbon's
Recent row shows this drawing's colours.

Color books tab: load AutoCAD .acb colour books (remembered in the
settings on desktop), browse them page by page with the page strip,
search by name and see the RGB equivalent. A book colour is applied as
RGB plus its BOOK$NAME identity on objects and layers instead of
dropping the name.

Strings translated into all 22 locales.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013rGmDUNr1hUf4zo1X3dak8

locales/de-DE/opencadstudio.ftl

@@ -1344,6 +1344,21 @@ common =
     .color-hex = Hex
     .nearest-index-color = Nächster Index
     .exact-index-match = Exakter Index-Treffer
+    .color-recently-used = Zuletzt verwendet
+    .color-most-used = Am häufigsten verwendet
+    .color-number = Farbnummer
+    .color-in-drawing = Farben in dieser Zeichnung
+    .color-sort = Sortieren
+    .color-no-drawing-colors = Noch keine Farben in dieser Zeichnung
+    .color-books = Farbbücher
+    .color-no-books = Keine Farbbücher geladen
+    .color-load-book = Farbbuch laden (.acb)
+    .color-book-label = Farbbuch
+    .color-rgb-equivalent = RGB-Entsprechung
+    .color-no-match = Keine passenden Farben
+    .color-not-a-book = Kein Farbbuch
+    .color-book-encrypted = Dieses Farbbuch ist verschlüsselt und kann nicht gelesen werden
+    .color-book-empty = Das Farbbuch enthält keine Farben
     .cad-color-index-aci-10-249 = ACI Farbindex 10–249
     .grayscale-250-255 = { common.grayscale } 250–255
     .isometric-drafting = Isometrisches Zeichnen