<doc>(conf): fix copybutton.

3.x/zh_CN/conf.py

@@ -323,6 +323,14 @@
    'Miscellaneous'),
 ]
 
+copybutton_image_svg = """
+<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-clipboard" width="44" height="44" viewBox="0 0 24 24" stroke-width="1.5" stroke="#000000" fill="none" stroke-linecap="round" stroke-linejoin="round">
+   <path stroke="none" d="M0 0h24v24H0z" fill="none"/>
+   <path d="M9 5h-2a2 2 0 0 0 -2 2v12a2 2 0 0 0 2 2h10a2 2 0 0 0 2 -2v-12a2 2 0 0 0 -2 -2h-2" />
+   <rect x="9" y="3" width="6" height="4" rx="2" />
+</svg>
+"""
+
 # Documents to append as an appendix to all manuals.
 #texinfo_appendices = []