translation: Switch to Qt TS source file

diff --git a/.tx/config b/.tx/config
index 41051254..a43890a3 100644
--- a/.tx/config
+++ b/.tx/config
@@ -1,7 +1,7 @@
 [main]
 host = https://www.transifex.com
 
-[o:bitcoin:p:bitcoin:r:qt-translation-031x]
-file_filter = src/qt/locale/bitcoin_<lang>.xlf
-source_file = src/qt/locale/bitcoin_en.xlf
+[o:bitcoin:p:bitcoin:r:qt-translation-032x]
+file_filter = src/qt/locale/bitcoin_<lang>.ts
+source_file = src/qt/locale/bitcoin_en.ts
 source_lang = en
diff --git a/doc/release-process.md b/doc/release-process.md
index 90ffd852..41f92c11 100644
--- a/doc/release-process.md
+++ b/doc/release-process.md
@@ -62,7 +62,7 @@ Release Process
     - In the project workflow settings, ensure that [Translation Memory Fill-up](https://help.transifex.com/en/articles/6224817-setting-up-translation-memory-fill-up) is enabled and that [Translation Memory Context Matching](https://help.transifex.com/en/articles/6224753-translation-memory-with-context) is disabled.
     - Update the Transifex slug in [`.tx/config`](/.tx/config) to the slug of the resource created in the first step. This identifies which resource the translations will be synchronized from.
     - Make an announcement that translators can start translating for the new version. You can use one of the [previous announcements](https://app.transifex.com/bitcoin/communication/) as a template.
-    - Change the auto-update URL for the resource to `master`, e.g. `https://raw.githubusercontent.com/bitcoin/bitcoin/master/src/qt/locale/bitcoin_en.xlf`. (Do this only after the previous steps, to prevent an auto-update from interfering.)
+    - Change the auto-update URL for the resource to `master`, e.g. `https://raw.githubusercontent.com/bitcoin/bitcoin/master/src/qt/locale/bitcoin_en.ts`. (Do this only after the previous steps, to prevent an auto-update from interfering.)
 
 #### After branch-off (on the major release branch)
 
@@ -71,7 +71,7 @@ Release Process
 - Clear the release notes: `cp doc/release-notes-empty-template.md doc/release-notes.md`
 - Create a pinned meta-issue for testing the release candidate (see [this issue](https://github.com/bitcoin/bitcoin/issues/27621) for an example) and provide a link to it in the release announcements where useful.
 - Translations on Transifex
-    - Change the auto-update URL for the new major version's resource away from `master` and to the branch, e.g. `https://raw.githubusercontent.com/bitcoin/bitcoin/<branch>/src/qt/locale/bitcoin_en.xlf`. Do not forget this or it will keep tracking the translations on master instead, drifting away from the specific major release.
+    - Change the auto-update URL for the new major version's resource away from `master` and to the branch, e.g. `https://raw.githubusercontent.com/bitcoin/bitcoin/<branch>/src/qt/locale/bitcoin_en.ts`. Do not forget this or it will keep tracking the translations on master instead, drifting away from the specific major release.
 - Prune inputs from the qa-assets repo (See [pruning
   inputs](https://github.com/bitcoin-core/qa-assets#pruning-inputs)).