chore: update project references and add Citron copyright

- Replaced all references to the old project name with Citron.
- Added Citron copyright information alongside existing notices in all files.

dist/languages/.tx/config

@@ -1,13 +1,13 @@
 [main]
 host = https://www.transifex.com
 
-[o:yuzu-emulator:p:yuzu:r:emulator]
+[o:citron-emulator:p:citron:r:emulator]
 file_filter = <lang>.ts
 source_file = en.ts
 source_lang = en
 type = QT
 
-[o:yuzu-emulator:p:yuzu:r:yuzu-android]
+[o:citron-emulator:p:citron:r:citron-android]
 file_filter = ../../src/android/app/src/main/res/values-<lang>/strings.xml
 source_file = ../../src/android/app/src/main/res/values/strings.xml
 type = ANDROID

dist/languages/README.md

@@ -1,3 +1,3 @@
-This directory stores translation patches (TS files) for yuzu Qt frontend. This directory is linked with [yuzu project on transifex](https://www.transifex.com/yuzu-emulator/yuzu), so you can update the translation by executing `tx pull -t -a`. If you want to contribute to the translation, please go the transifex link and submit your translation there. This directory on the main repo will be synchronized with transifex periodically.
+This directory stores translation patches (TS files) for citron Qt frontend. This directory is linked with [citron project on transifex](https://www.transifex.com/citron-emulator/citron), so you can update the translation by executing `tx pull -t -a`. If you want to contribute to the translation, please go the transifex link and submit your translation there. This directory on the main repo will be synchronized with transifex periodically.
 
 Do not directly open PRs on github to modify the translation.