set string "Build flavor" to translatable=false

otherwise translators won't understand what this is.
As translations were already made a new key was introduced to avoid "Translated Untranslatable" warnings

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/diagnose/DiagnoseActivity.kt

@@ -251,7 +251,7 @@ class DiagnoseActivity : BaseActivity() {
         addKey(context.resources.getString(R.string.nc_diagnose_app_version_title))
         addValue(String.format("v" + BuildConfig.VERSION_NAME))
 
-        addKey(context.resources.getString(R.string.nc_diagnose_build_flavor))
+        addKey(context.resources.getString(R.string.nc_diagnose_flavor))
         addValue(BuildConfig.FLAVOR)
 
         if (isGooglePlayServicesAvailable) {

app/src/main/res/values/strings.xml

@@ -211,7 +211,6 @@ How to translate with transifex:
     <string name="nc_diagnose_app_version_title">App version</string>
     <string name="nc_diagnose_app_users_amount">Registered users</string>
     <string name="nc_diagnose_gplay_available_title">Google Play services</string>
-    <string name="nc_diagnose_build_flavor">Build flavor</string>
     <string name="nc_diagnose_gplay_available_yes">Google Play services are available</string>
     <string name="nc_diagnose_gplay_available_no">Google Play services are not available. Notifications are not supported</string>
     <string name="nc_diagnose_battery_optimization_title">Battery settings</string>
@@ -240,6 +239,7 @@ How to translate with transifex:
     <string name="nc_diagnose_signaling_mode_extern">External</string>
     <string name="send_email">Send email</string>
     <string name="create_issue">Create issue</string>
+    <string name="nc_diagnose_flavor" translatable="false">Build flavor</string>
 
     <!-- Conversation menu -->
     <string name="nc_leave">Leave conversation</string>