Consolidate strings.xml files from app-common to app module

- Merged all 76 locale strings.xml files from app-common to app module
- Removed app-common module dependency from app/build.gradle.kts
- Removed app-common from settings.gradle
- Fixed all BuildConfig and R class import statements
- Updated fully qualified R references from eu.darken.capod.common.R to R
- Deleted entire app-common directory and all associated files
- Added temporary fallback for missing GITSHA BuildConfig field

The project now has a simplified structure with all string resources
consolidated in the app module, eliminating the unnecessary app-common
module while maintaining full functionality.

Builds successfully for both FOSS and Google Play variants.

crowdin.yaml

@@ -4,9 +4,9 @@
 
 "files": [
   {
-    "source": "/app-common/src/main/res/values/strings.xml",
-    "dest": "/strings-common.xml",
-    "translation": "/app-common/src/main/res/values-%android_code%/strings.xml",
+    "source": "/app/src/main/res/values/strings.xml",
+    "dest": "/strings-app.xml",
+    "translation": "/app/src/main/res/values-%android_code%/strings.xml",
     #    "update_option" : "update_without_changes",
     "languages_mapping": &stringmapping {
       "android_code": {
@@ -96,12 +96,6 @@
     "translation": "/app/src/foss/res/values-%android_code%/strings.xml",
     #    "update_option" : "update_without_changes",
     "languages_mapping": *stringmapping
-  },   {
-    "source": "/app/src/main/res/values/strings.xml",
-    "dest": "/strings-app.xml",
-    "translation": "/app/src/main/res/values-%android_code%/strings.xml",
-    #    "update_option" : "update_without_changes",
-    "languages_mapping": *stringmapping
   }, {
     "source": "/fastlane/metadata/android/en-US/full_description.txt",
     "dest": "/description.txt",