A few grammar fixes for error messages.

AddCollectionController.m

@@ -40,7 +40,7 @@ - (IBAction)cancel:(id)sender {
 
 - (IBAction)add:(id)sender {
     if ([ [collectionname stringValue] length] == 0) {
-        NSRunAlertPanel(@"Error", @"Collection name could not be empty", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Collection name can not be empty", @"OK", nil, nil);
         return;
     }
     NSArray *keys = [[NSArray alloc] initWithObjects:@"dbname", @"collectionname", nil];

AddConnectionController.m

@@ -175,19 +175,19 @@ - (BOOL)validateConnection
         return NO;
     }
     if ([[connectionInfo objectForKey:@"alias"] length]<3) {
-        NSRunAlertPanel(@"Error", @"Connection name should not be less than 3 charaters", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Alias should not be less than 3 charaters", @"OK", nil, nil);
         return NO;
     }
     if ([connectionsArrayController checkDuplicate:[connectionInfo objectForKey:@"alias"]]) {
-        NSRunAlertPanel(@"Error", @"Connection alias name has been existed!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Alias already in use!", @"OK", nil, nil);
         return NO;
     }
     if ([usesshCheckBox state] == 1 && ([[connectionInfo objectForKey:@"bindaddress"] length] == 0 || [[connectionInfo objectForKey:@"sshhost"] length] == 0)) {
-        NSRunAlertPanel(@"Error", @"Please full fill ssh information!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Tunneling requires both Bind Address and SSH Host!", @"OK", nil, nil);
         return NO;
     }
     if ([usereplCheckBox state] == 1 && ([[connectionInfo objectForKey:@"servers"] length] == 0 || [[connectionInfo objectForKey:@"repl_name"] length] == 0)) {
-        NSRunAlertPanel(@"Error", @"Please full fill replica-set information!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Replica Set requires both Servers and Set Name!", @"OK", nil, nil);
         return NO;
     }
     return YES;

AddDBController.m

@@ -51,7 +51,7 @@ - (IBAction)cancel:(id)sender {
 
 - (IBAction)add:(id)sender {
     if ([ [dbname stringValue] length] == 0) {
-        NSRunAlertPanel(@"Error", @"Database name could not be empty", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Database name can not be empty", @"OK", nil, nil);
         return;
     }
     NSArray *keys = [[NSArray alloc] initWithObjects:@"dbname", @"user", @"password", nil];

EditConnectionController.m

@@ -212,19 +212,19 @@ - (BOOL)validateConnection:(NSDictionary *)connectionInfo
         return NO;
     }
     if ([[connectionInfo objectForKey:@"alias"] length]<3) {
-        NSRunAlertPanel(@"Error", @"Connection name should not be less than 3 charaters", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Alias should not be less than 3 charaters", @"OK", nil, nil);
         return NO;
     }
     if (![[connectionInfo objectForKey:@"alias"] isEqualToString:connection.alias] && [connectionsArrayController checkDuplicate:[connectionInfo objectForKey:@"alias"]]) {
-        NSRunAlertPanel(@"Error", @"Connection alias name has been existed!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Alias already in use!", @"OK", nil, nil);
         return NO;
     }
     if ([usesshCheckBox state] == 1 && ([[connectionInfo objectForKey:@"bindaddress"] length] == 0 || [[connectionInfo objectForKey:@"sshhost"] length] == 0)) {
-        NSRunAlertPanel(@"Error", @"Please full fill ssh information!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Tunneling requires both Bind Address and SSH Host!", @"OK", nil, nil);
         return NO;
     }
     if ([usereplCheckBox state] == 1 && ([[connectionInfo objectForKey:@"servers"] length] == 0 || [[connectionInfo objectForKey:@"repl_name"] length] == 0)) {
-        NSRunAlertPanel(@"Error", @"Please full fill replica-set information!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Replica Set requires both Servers and Set Name!", @"OK", nil, nil);
         return NO;
     }
     return YES;

ExportWindowController.mm

@@ -79,7 +79,7 @@ - (IBAction)export:(id)sender {
     [progressIndicator setDoubleValue:0];
     NSString *collection = [[NSString alloc] initWithString:[collectionTextField stringValue]];
     if (![collection isPresent]) {
-        NSRunAlertPanel(@"Error", @"Collection name could not be empty!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Collection name can not be empty!", @"OK", nil, nil);
         return;
     }
     NSString *tablename = [[NSString alloc] initWithString:[tablesPopUpButton titleOfSelectedItem]];

ImportWindowController.mm

@@ -79,11 +79,11 @@ - (IBAction)import:(id)sender {
     NSString *collection = [[NSString alloc] initWithString:[collectionTextField stringValue]];
     int chunkSize = [chunkSizeTextField intValue];
     if (![collection isPresent]) {
-        NSRunAlertPanel(@"Error", @"Collection name could not be empty!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Collection name can not be empty!", @"OK", nil, nil);
         return;
     }
     if (chunkSize == 0) {
-        NSRunAlertPanel(@"Error", @"Chunk Size could not be 0!", @"OK", nil, nil);
+        NSRunAlertPanel(@"Error", @"Chunk Size can not be 0!", @"OK", nil, nil);
         return;
     }
     NSString *tablename = [[NSString alloc] initWithString:[tablesPopUpButton titleOfSelectedItem]];