Log to file: improve strings.

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

@@ -59,7 +59,7 @@
     <!-- global settings -->
     <string name="logging_davdroid_file_logging">EteSync file logging is ON</string>
     <string name="logging_to_external_storage">Logging to external storage: %s</string>
-    <string name="logging_to_external_storage_warning">Delete logs as soon as possible!</string>
+    <string name="logging_to_external_storage_warning">Disabling will delete logs</string>
     <string name="logging_couldnt_create_file">Couldn\'t create external log file: %s</string>
     <string name="logging_no_external_storage">External storage not found</string>
 
@@ -103,9 +103,9 @@
     <string name="app_settings_reset_certificates_summary">Resets trust of all custom certificates</string>
     <string name="app_settings_reset_certificates_success">All custom certificates have been cleared</string>
     <string name="app_settings_debug">Debugging</string>
-    <string name="app_settings_log_to_external_storage">Log to external file</string>
-    <string name="app_settings_log_to_external_storage_on">Logging to external storage. Disable to hide the notification.</string>
-    <string name="app_settings_log_to_external_storage_off">External file logging is disabled</string>
+    <string name="app_settings_log_to_external_storage">Log to file</string>
+    <string name="app_settings_log_to_external_storage_on">Disable to hide the notification and delete the logs</string>
+    <string name="app_settings_log_to_external_storage_off">Enable to save log messages to file</string>
     <string name="app_settings_log_verbose">Verbose logging</string>
     <string name="app_settings_log_verbose_summary">Verbose logs may contain private information</string>
     <string name="app_settings_show_debug_info">Show debug info</string>