diff --git a/app/src/main/java/fr/free/nrw/commons/LicenseList.java b/app/src/main/java/fr/free/nrw/commons/LicenseList.java
index e94ce655d..0ef067496 100644
--- a/app/src/main/java/fr/free/nrw/commons/LicenseList.java
+++ b/app/src/main/java/fr/free/nrw/commons/LicenseList.java
@@ -55,7 +55,7 @@ public class LicenseList {
     public String nameIdForTemplate(String template) {
         // hack :D (converts dashes and periods to underscores)
         // cc-by-sa-3.0 -> cc_by_sa_3_0
-        return "license_name_" + template.toLowerCase(Locale.US).replace("-", "_").replace(".", "_");
+        return "license_name_" + template.toLowerCase(Locale.ENGLISH).replace("-", "_").replace(".", "_");
     }
 
     private int stringIdByName(String stringId) {
diff --git a/app/src/main/java/fr/free/nrw/commons/Utils.java b/app/src/main/java/fr/free/nrw/commons/Utils.java
index 886ec459f..91121e060 100644
--- a/app/src/main/java/fr/free/nrw/commons/Utils.java
+++ b/app/src/main/java/fr/free/nrw/commons/Utils.java
@@ -82,7 +82,7 @@ public class Utils {
     }
 
     public static Date parseMWDate(String mwDate) {
-        SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US); // Assuming MW always gives me UTC
+        SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ENGLISH); // Assuming MW always gives me UTC
         try {
             return isoFormat.parse(mwDate);
         } catch (ParseException e) {
@@ -91,7 +91,7 @@ public class Utils {
     }
 
     public static String toMWDate(Date date) {
-        SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US); // Assuming MW always gives me UTC
+        SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ENGLISH); // Assuming MW always gives me UTC
         isoFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
         return isoFormat.format(date);
     }
@@ -304,11 +304,11 @@ public class Utils {
         Pattern jpegPattern = Pattern.compile("\\.jpeg$", Pattern.CASE_INSENSITIVE);
 
         // People are used to ".jpg" more than ".jpeg" which the system gives us.
-        if (extension != null && extension.toLowerCase(Locale.US).equals("jpeg")) {
+        if (extension != null && extension.toLowerCase(Locale.ENGLISH).equals("jpeg")) {
             extension = "jpg";
         }
         title = jpegPattern.matcher(title).replaceFirst(".jpg");
-        if (extension != null && !title.toLowerCase(Locale.US).endsWith("." + extension.toLowerCase(Locale.US))) {
+        if (extension != null && !title.toLowerCase(Locale.getDefault()).endsWith("." + extension.toLowerCase(Locale.ENGLISH))) {
             title += "." + extension;
         }
         return title;
diff --git a/app/src/main/java/fr/free/nrw/commons/auth/LoginActivity.java b/app/src/main/java/fr/free/nrw/commons/auth/LoginActivity.java
index 3e8b137f6..9b76fb627 100644
--- a/app/src/main/java/fr/free/nrw/commons/auth/LoginActivity.java
+++ b/app/src/main/java/fr/free/nrw/commons/auth/LoginActivity.java
@@ -31,6 +31,7 @@ import java.util.Locale;
 import fr.free.nrw.commons.CommonsApplication;
 import fr.free.nrw.commons.EventLog;
 import fr.free.nrw.commons.R;
+import fr.free.nrw.commons.Utils;
 import fr.free.nrw.commons.WelcomeActivity;
 import fr.free.nrw.commons.contributions.ContributionsActivity;
 import fr.free.nrw.commons.contributions.ContributionsContentProvider;
@@ -221,7 +222,7 @@ public class LoginActivity extends AccountAuthenticatorActivity {
     private void performLogin() {
         String username = usernameEdit.getText().toString();
         // Because Mediawiki is upercase-first-char-then-case-sensitive :)
-        String canonicalUsername = username.substring(0,1).toUpperCase(Locale.getDefault()) + username.substring(1);
+        String canonicalUsername = Utils.capitalize(username.substring(0,1)) + username.substring(1);
 
         String password = passwordEdit.getText().toString();
 
diff --git a/app/src/main/java/fr/free/nrw/commons/contributions/Contribution.java b/app/src/main/java/fr/free/nrw/commons/contributions/Contribution.java
index df84de332..482a4df7f 100644
--- a/app/src/main/java/fr/free/nrw/commons/contributions/Contribution.java
+++ b/app/src/main/java/fr/free/nrw/commons/contributions/Contribution.java
@@ -132,7 +132,7 @@ public class Contribution extends Media {
 
     public String getPageContents() {
         StringBuffer buffer = new StringBuffer();
-        SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
+        SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
         
         buffer
             .append("== {{int:filedesc}} ==\n")