ICU-23231 Update the ICU 78 download page for the 78.2 release

Author: echeran

docs/download/78.md

@@ -18,6 +18,8 @@ used by a [wide array of companies and organizations](https://icu.unicode.org/#h
 
 ## Release Overview
 
+Note: The ICU 78.2 maintenance update (see below) was released on 2026-01-08.
+
 * Download: [releases/tag/release-78.1](https://github.com/unicode-org/icu/releases/tag/release-78.1)
 * Maven: [com.ibm.icu / icu4j / version 78.1](https://mvnrepository.com/artifact/com.ibm.icu/icu4j/78.1)
 
@@ -69,37 +71,30 @@ If there are maintenance releases, they will be 78.2, 78.3, etc. (During ICU 78
 
 Note: There may be additional commits on the [maint/maint-78](https://github.com/unicode-org/icu/tree/maint/maint-78) branch that are not included in the prepackaged download files.
 
-### Upcoming ICU 78.2
+### ICU 78.2 maintenance release
+
+Release date: 2026-01-08
 
-We are planning on an ICU 78.2 maintenance release with a small number of bug fixes,
+ICU 78.2 updates to [CLDR 48.1](https://cldr.unicode.org/downloads/cldr-48). ICU 78.2 also includes a small number of bug fixes,
 as well as a minor update for time zone data (tzdata) version 2025c (2025-dec)
 [ICU-23296](https://unicode-org.atlassian.net/browse/ICU-23296).
   * [List of tickets fixed in ICU 78.2](https://unicode-org.atlassian.net/issues/?jql=project%20%3D%20ICU%20AND%20status%20%3D%20Done%20AND%20resolution%20in%20%28Fixed%2C%20%22Fixed%20by%20Other%20Ticket%22%29%20AND%20fixVersion%20%3D%2078.2%20ORDER%20BY%20component%20ASC%2C%20created%20DESC)
 
-These are currently available on the [maint/maint-78](https://github.com/unicode-org/icu/tree/maint/maint-78) branch.
+Changes in ICU 78.2:
 
 * C++ [ICU-23261](https://unicode-org.atlassian.net/browse/ICU-23261) “ucasemap_setLocale() ignores uloc_getName() failures”
   * When calling case mapping functions with a bogus locale ID,
     code will read uninitialized memory to select among case-mapping-relevant languages.
-  * Bug fixes on [`main`](https://github.com/unicode-org/icu/pull/3773) &
-    [`maint/maint-78`](https://github.com/unicode-org/icu/pull/3774)
 * Java & C++ [ICU-23278](https://unicode-org.atlassian.net/browse/ICU-23278) “Unexpected timezone name change for Europe/Dublin in ICU 78.1”
   * Due to a data bug, the long time zone name for Europe/Dublin
     incorrectly yielded “GMT+01:00” instead of “Irish Standard Time“,
     and “GMT+00:00” instead of “Greenwich Mean Time“.
-  * Bug fixes on [`main`](https://github.com/unicode-org/icu/pull/3792) &
-    [`maint/maint-78`](https://github.com/unicode-org/icu/pull/3784)
 * C++ [ICU-23293](https://unicode-org.atlassian.net/browse/ICU-23293) “Remove attribute 'dllexport' from deleted functions”
   * C++ build issue on the clang-cl compiler.
-  * Bug fixes on [`main`](https://github.com/unicode-org/icu/pull/3794) &
-    [`maint/maint-78`](https://github.com/unicode-org/icu/pull/3798)
 * C++ [ICU-23299](https://unicode-org.atlassian.net/browse/ICU-23299) “ICU76 operator+ on UnicodeString causes standard operator+ on standard types to become ambiguous”
   * C++ build issue with non-ICU code when ICU headers are included.
-  * Bug fixes on [`main`](https://github.com/unicode-org/icu/pull/3809) &
-    [`maint/maint-78`](https://github.com/unicode-org/icu/pull/3817)
-* Several CLDR data bug fixes in upcoming CLDR 48.1.
-  * See [CLDR 48](https://cldr.unicode.org/downloads/cldr-48)
-  * See the “Linked work items” for [CLDR-19148](https://unicode-org.atlassian.net/browse/CLDR-19148)
+* [List of all tickets fixed in ICU 78.2](https://unicode-org.atlassian.net/projects/ICU/versions/10542/tab/release-report-all-issues)
+
 
 ## Common Changes
 
@@ -192,7 +187,7 @@ These are currently available on the [maint/maint-78](https://github.com/unicode
 
 ## Known Issues
 
-See the list of issues for the [Upcoming ICU 78.2](#upcoming-icu-782)
+* (none yet)
 
 ## Migration Issues
 
@@ -223,15 +218,21 @@ ICU4J should work on Android API level 21 and later but may require “[library
 
 ### GitHub
 Source and binary downloads are available on the git/GitHub tag page:
-<https://github.com/unicode-org/icu/releases/tag/release-78.1>
+
+* 78.2: <https://github.com/unicode-org/icu/releases/tag/release-78.2>
+* 78.1: <https://github.com/unicode-org/icu/releases/tag/release-78.1>
 
 See the [Source Code Setup](../devsetup/source/) page for how to download the ICU file tree directly from GitHub.
 
 ICU locale data was generated from CLDR data equivalent to:
 
-* <https://github.com/unicode-org/cldr/releases/tag/release-48>
-* <https://github.com/unicode-org/cldr-staging/releases/tag/release-48>
+* 78.2:
+    * <https://github.com/unicode-org/cldr/releases/tag/release-48-1-final1>
+    * <https://github.com/unicode-org/cldr-staging/releases/tag/release-48-1-final1>
+* 78.1:
+    * <https://github.com/unicode-org/cldr/releases/tag/release-48>
+    * <https://github.com/unicode-org/cldr-staging/releases/tag/release-48>
 
 ### Maven
-* https://mvnrepository.com/artifact/com.ibm.icu/icu4j/78.1
-* https://mvnrepository.com/artifact/com.ibm.icu/icu4j-charset/78.1
+* https://mvnrepository.com/artifact/com.ibm.icu/icu4j/78.2
+* https://mvnrepository.com/artifact/com.ibm.icu/icu4j-charset/78.2