Performs some minor fixes and improvements

src/main/java/net/knarcraft/knarlib/KnarLib.java

@@ -23,7 +23,7 @@ public final class KnarLib {
      *
      * @param plugin <p>The plugin instance to use</p>
      */
-    public static void setPlugin(final JavaPlugin plugin) {
+    public static void setPlugin(JavaPlugin plugin) {
         KnarLib.plugin = plugin;
     }
 

src/main/java/net/knarcraft/knarlib/formatting/StringFormatter.java

@@ -21,7 +21,7 @@ public final class StringFormatter {
      * @param sender  <p>The command sender to display the message to</p>
      * @param message <p>The translatable message to display</p>
      */
-    public static void displaySuccessMessage(CommandSender sender, TranslatableTimeUnit message) {
+    public static void displaySuccessMessage(CommandSender sender, TranslatableMessage message) {
         sender.sendMessage(ChatColor.GREEN + getFormattedMessage(Translator.getTranslatedMessage(message)));
     }
 
@@ -41,10 +41,20 @@ public final class StringFormatter {
      * @param sender  <p>The command sender to display the message to</p>
      * @param message <p>The translatable message to display</p>
      */
-    public static void displayErrorMessage(CommandSender sender, TranslatableTimeUnit message) {
+    public static void displayErrorMessage(CommandSender sender, TranslatableMessage message) {
         sender.sendMessage(ChatColor.DARK_RED + getFormattedMessage(Translator.getTranslatedMessage(message)));
     }
 
+    /**
+     * Displays a message signifying an unsuccessful action
+     *
+     * @param sender  <p>The command sender to display the message to</p>
+     * @param message <p>The translatable message to display</p>
+     */
+    public static void displayErrorMessage(CommandSender sender, String message) {
+        sender.sendMessage(ChatColor.DARK_RED + getFormattedMessage(message));
+    }
+
     /**
      * Gets the formatted version of any chat message
      *

src/main/java/net/knarcraft/knarlib/formatting/TranslatableTimeUnit.java

@@ -3,7 +3,8 @@ package net.knarcraft.knarlib.formatting;
 /**
  * An enum containing all translatable time units
  *
- * <p>These time units must have a translatable message to use the time formatter</p>
+ * <p>These time units must have a translatable message if you want to use the time formatter. Register one value with
+ * the translator's "registerMessageCategory" method!</p>
  */
 public enum TranslatableTimeUnit implements TranslatableMessage {
 

src/main/java/net/knarcraft/knarlib/formatting/Translator.java

@@ -12,6 +12,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.InputStreamReader;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -22,7 +23,7 @@ import java.util.logging.Level;
  */
 public final class Translator {
 
-    private static List<TranslatableMessage> messageCategories;
+    private static final List<TranslatableMessage> messageCategories = new ArrayList<>();
     private static Map<TranslatableMessage, String> translatedMessages;
     private static Map<TranslatableMessage, String> backupTranslatedMessages;
 

src/main/java/net/knarcraft/knarlib/util/UpdateChecker.java

@@ -57,13 +57,13 @@ public final class UpdateChecker {
             String oldVersion = getVersionMethod.get();
             //If there is a newer version, notify the user
             if (isVersionHigher(oldVersion, newVersion)) {
-                plugin.getLogger().log(Level.INFO, getUpdateAvailableString(newVersion, oldVersion));
+                plugin.getLogger().log(Level.WARNING, getUpdateAvailableString(newVersion, oldVersion));
                 if (setVersionMethod != null) {
                     setVersionMethod.accept(newVersion);
                 }
             }
         } catch (IOException e) {
-            plugin.getLogger().log(Level.WARNING, "Unable to get newest version.");
+            plugin.getLogger().log(Level.WARNING, "Unable to get the newest plugin version.");
         }
     }