Make flag error messages translatable

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/config/Captions.java

@@ -548,7 +548,19 @@ public enum Captions {
     FLAG_CATEGORY_BOOLEAN("Boolean Flags", "Flags"),
     FLAG_CATEGORY_MIXED("Mixed Value Flags", "Flags"),
     //</editor-fold>
-
+    //<editor-fold desc="Flag category errors">
+    FLAG_ERROR_BOOLEAN("Flag value must be a boolean (true|false)", "Flags"),
+    FLAG_ERROR_ENUM("Must be one of: %s", "Flags"),
+    FLAG_ERROR_GAMEMODE("Flag value must be a gamemode: 'survival', 'creative', 'adventure' or 'spectator.", "Flags"),
+    FLAG_ERROR_INTEGER("Flag value must be a whole number", "Flags"),
+    FLAG_ERROR_INTEGER_LIST("Flag value must be an integer list", "Flags"),
+    FLAG_ERROR_INTERVAL("Value(s) must be numeric. /plot set flag <flag> <interval> [amount]", "Flags"),
+    FLAG_ERROR_LONG("Flag value must be a whole number (large numbers allowed)", "Flags"),
+    FLAG_ERROR_PLOTBLOCKLIST("Flag value must be a block list", "Flags"),
+    FLAG_ERROR_WEATHER("Flag must be a weather: 'rain' or 'sun'", "Flags"),
+    FLAG_ERROR_STRING("Flag value must be alphanumeric. Some special characters are allowed.", "Flags"),
+    FLAG_ERROR_STRINGLIST("Flag value must be a string list", "Flags"),
+    //</editor-fold>
     //<editor-fold desc="Trusted">
     TRUSTED_ADDED("$4You successfully trusted a user to the plot", "Trusted"),
     WAS_NOT_ADDED("$2That player was not trusted on this plot", "Trusted"),

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/BooleanFlag.java

@@ -31,7 +31,7 @@ public class BooleanFlag extends Flag<Boolean> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a boolean (true|false)";
+        return Captions.FLAG_ERROR_BOOLEAN.getTranslated();
     }
 
     public boolean isTrue(Plot plot) {

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/DoubleFlag.java

@@ -22,6 +22,6 @@ public class DoubleFlag extends Flag<Double> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a number.";
+        return Captions.FLAG_ERROR_BOOLEAN.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/EnumFlag.java

@@ -28,6 +28,6 @@ public class EnumFlag extends Flag<String> {
     }
 
     @Override public String getValueDescription() {
-        return "Must be one of: " + StringMan.getString(values);
+        return Captions.FLAG_ERROR_ENUM.getTranslated() + StringMan.getString(values);
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/GameModeFlag.java

@@ -37,6 +37,6 @@ public class GameModeFlag extends Flag<PlotGameMode> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a gamemode: 'survival', 'creative', 'adventure' or 'spectator'";
+        return Captions.FLAG_ERROR_GAMEMODE.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/IntegerFlag.java

@@ -10,7 +10,7 @@ public class IntegerFlag extends Flag<Integer> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a whole number";
+        return Captions.FLAG_ERROR_INTEGER.getTranslated();
     }
 
     @Override public String valueToString(Object value) {

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/IntegerListFlag.java

@@ -27,6 +27,6 @@ public class IntegerListFlag extends ListFlag<List<Integer>> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be an integer list";
+        return Captions.FLAG_ERROR_INTEGER_LIST.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/IntervalFlag.java

@@ -40,7 +40,7 @@ public class IntervalFlag extends Flag<IntervalFlag.Interval> {
     }
 
     @Override public String getValueDescription() {
-        return "Value(s) must be numeric. /plot set flag <flag> <interval> [amount]";
+        return Captions.FLAG_ERROR_INTERVAL.getTranslated();
     }
 
     @EqualsAndHashCode @RequiredArgsConstructor @Getter public static final class Interval {

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/LongFlag.java

@@ -21,6 +21,6 @@ public class LongFlag extends Flag<Long> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a whole number (large numbers allowed)";
+        return Captions.FLAG_ERROR_LONG.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/PlotBlockListFlag.java

@@ -29,6 +29,6 @@ public class PlotBlockListFlag extends ListFlag<HashSet<PlotBlock>> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a block list";
+        return Captions.FLAG_ERROR_PLOTBLOCKLIST.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/PlotWeatherFlag.java

@@ -31,6 +31,6 @@ public class PlotWeatherFlag extends Flag<PlotWeather> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag must be a weather: 'rain' or 'sun'";
+        return Captions.FLAG_ERROR_WEATHER.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/StringFlag.java

@@ -18,6 +18,6 @@ public class StringFlag extends Flag<String> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be alphanumeric. Some special characters are allowed.";
+        return Captions.FLAG_ERROR_STRING.getTranslated();
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/flag/StringListFlag.java

@@ -22,6 +22,6 @@ public class StringListFlag extends ListFlag<List<String>> {
     }
 
     @Override public String getValueDescription() {
-        return "Flag value must be a string list";
+        return Captions.FLAG_ERROR_STRINGLIST.getTranslated();
     }
 }