choose-mirror: fix utf-8 on udeb via upgrade release

helpers/DATA/choose-mirror/choose-mirror-bin.templates-in.patch

@@ -0,0 +1,22 @@
+diff -ru choose-mirror-2.78ubuntu7+10.0trisquel3/debian/choose-mirror-bin.templates-in choose-mirror-2.111/debian/choose-mirror-bin.templates-in
+--- choose-mirror-2.78ubuntu7+10.0trisquel3/debian/choose-mirror-bin.templates-in	2021-02-26 15:22:56.000000000 -0600
++++ choose-mirror-2.111/debian/choose-mirror-bin.templates-in	2021-02-08 06:52:03.000000000 -0600
+@@ -12,14 +12,10 @@
+ Type: select
+ Choices-C: ${CHOICES-C}
+ Choices: ${CHOICES}
++Default: _CODENAME_
++Description: Trisquel version to install:
++ In Trisquel, this question is never asked, and is only for preseeding.
++ Caveat emptor.
+-# :sl2:
+-_Description: Debian version to install:
+- Debian comes in several flavors. Stable is well-tested and rarely changes.
+- Unstable is untested and frequently changing. Testing is a middle ground,
+- that receives many of the new versions from unstable if they are not too
+- buggy.
+- .
+- Only flavors available on the selected mirror are listed.
+ 
+ Template: mirror/codename
+ Type: string