register defaults to fix a crash

QuickLocalization/OLSettingController.h

@@ -11,4 +11,5 @@ extern NSUInteger QL_CountOccurentOfStringWithSubString(NSString *str, NSString
 
 @interface OLSettingController : NSWindowController
 @property (nonatomic, weak) NSBundle *bundle;
++ (void)registerFormatStringDefaults;
 @end

QuickLocalization/OLSettingController.m

@@ -162,4 +162,8 @@ NSUInteger QL_CountOccurentOfStringWithSubString(NSString *str, NSString *subStr
     
     return savedFormatString;
 }
+
++ (void)registerFormatStringDefaults {
+    [[NSUserDefaults standardUserDefaults] registerDefaults:@{kQLFormatStringKey: @"NSLocalizedString(%@, %@)"}];
+}
 @end

QuickLocalization/QuickLocalization.m

@@ -72,6 +72,7 @@ static id sharedPlugin = nil;
 
 - (void)applicationDidFinishLaunching:(NSNotification *)notification {
     [self createMenuItem];
+    [OLSettingController registerFormatStringDefaults];
 }
 
 - (void)createMenuItem {