some english fixes

Author: tibbi

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

@@ -11,11 +11,11 @@
     <!-- About -->
     <string name="about">About</string>
     <string name="website">More simple apps and source code at:\nhttp://simplemobiletools.com</string>
-    <string name="email_label">Send your feedback or suggestions at:</string>
+    <string name="email_label">Send your feedback or suggestions to:</string>
     <string name="email">[email protected]</string>
     <string name="third_party_licences_underlined"><u>Third party licences</u></string>
     <string name="rate_us_underlined"><u>Rate us in the Play Store</u></string>
-    <string name="follow_us">Follow us at:</string>
+    <string name="follow_us">Follow us:</string>
     <string name="version">v %1$s</string>
     <string name="copyright">Copyright © Simple Mobile Tools %1$d</string>