Load localizations automatically.

Also included a sample "backwards" localization to demonstrate that it does in fact work.

proxy/src/main/resources/com/velocitypowered/proxy/l10n/messages.properties

@@ -27,7 +27,7 @@ velocity.error.online-mode-only=You are not logged into your Minecraft account.
 velocity.error.player-connection-error=An internal error occurred in your connection.
 velocity.error.modern-forwarding-needs-new-client=This server is only compatible with Minecraft 1.13 and above.
 velocity.error.modern-forwarding-failed=Your server did not send a forwarding request to the proxy. Make sure the server is configured for Velocity forwarding.
-velocity.error.moved-to-new-server=YOu were kicked from {0}: {1}
+velocity.error.moved-to-new-server=You were kicked from {0}: {1}
 velocity.error.no-available-servers=There are no available servers to connect you to. Try again later or contact an admin.
 
 # Commands

proxy/src/main/resources/com/velocitypowered/proxy/l10n/messages_en_UD.properties

@@ -0,0 +1,62 @@
+#
+# Copyright (C) 2018 Velocity Contributors
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+
+velocity.error.already-connected=¡ɹǝʌɹǝs sᴉɥʇ oʇ pǝʇɔǝuuoɔ ʎpɐǝɹlɐ ǝɹɐ no⅄
+velocity.error.already-connected-proxy=¡ʎxoɹd sᴉɥʇ oʇ pǝʇɔǝuuoɔ ʎpɐǝɹlɐ ǝɹɐ no⅄
+velocity.error.already-connecting=¡ɹǝʌɹǝs ɐ oʇ ʇɔǝuuoɔ oʇ ƃuᴉʎɹʇ ʎpɐǝɹlɐ ǝɹɐ no⅄
+velocity.error.cant-connect={1} :{0} oʇ ʇɔǝuuoɔ oʇ ǝlqɐu∩
+velocity.error.connecting-server-error=˙ɹǝʇɐl uᴉɐƃɐ ʎɹʇ ǝsɐǝlԀ ˙{0} oʇ noʎ ʇɔǝuuoɔ oʇ ǝlqɐu∩
+velocity.error.connected-server-error=˙ɯǝlqoɹd ɐ pǝɹǝʇunoɔuǝ {0} oʇ uoᴉʇɔǝuuoɔ ɹno⅄
+velocity.error.internal-server-connection-error=˙pǝɹɹnɔɔo ɹoɹɹǝ uoᴉʇɔǝuuoɔ ɹǝʌɹǝs lɐuɹǝʇuᴉ u∀
+velocity.error.logging-in-too-fast=˙ɹǝʇɐl uᴉɐƃɐ ʎɹʇ 'ʇsɐɟ ooʇ uᴉ ƃuᴉƃƃol ǝɹɐ no⅄
+velocity.error.online-mode-only=˙ʇuǝᴉlɔ ʇɟɐɹɔǝuᴉW ɹnoʎ ƃuᴉʇɹɐʇsǝɹ ʎɹʇ 'ʇunoɔɔɐ ʇɟɐɹɔǝuᴉW ɹnoʎ oʇuᴉ pǝƃƃol ǝɹɐ noʎ ɟI ˙ʇunoɔɔɐ ʇɟɐɹɔǝuᴉW ɹnoʎ oʇuᴉ pǝƃƃol ʇou ǝɹɐ no⅄
+velocity.error.player-connection-error=˙uoᴉʇɔǝuuoɔ ɹnoʎ uᴉ pǝɹɹnɔɔo ɹoɹɹǝ lɐuɹǝʇuᴉ u∀
+velocity.error.modern-forwarding-needs-new-client=˙ǝʌoqɐ puɐ ƐƖ˙Ɩ ʇɟɐɹɔǝuᴉW ɥʇᴉʍ ǝlqᴉʇɐdɯoɔ ʎluo sᴉ ɹǝʌɹǝs sᴉɥ┴
+velocity.error.modern-forwarding-failed=˙ƃuᴉpɹɐʍɹoɟ ʎʇᴉɔolǝΛ ɹoɟ pǝɹnƃᴉɟuoɔ sᴉ ɹǝʌɹǝs ǝɥʇ ǝɹns ǝʞɐW ˙ʎxoɹd ǝɥʇ oʇ ʇsǝnbǝɹ ƃuᴉpɹɐʍɹoɟ ɐ puǝs ʇou pᴉp ɹǝʌɹǝs ɹno⅄
+velocity.error.moved-to-new-server={1} :{0} ɯoɹɟ pǝʞɔᴉʞ ǝɹǝʍ no⅄
+velocity.error.no-available-servers=˙uᴉɯpɐ uɐ ʇɔɐʇuoɔ ɹo ɹǝʇɐl uᴉɐƃɐ ʎɹ┴ ˙oʇ noʎ ʇɔǝuuoɔ oʇ sɹǝʌɹǝs ǝlqɐlᴉɐʌɐ ou ǝɹɐ ǝɹǝɥ┴
+
+# Commands
+velocity.command.generic-error=˙puɐɯɯoɔ sᴉɥʇ ƃuᴉuunɹ ǝlᴉɥʍ pǝɹɹnɔɔo ɹoɹɹǝ u∀
+velocity.command.command-does-not-exist=˙ʇsᴉxǝ ʇou sǝop puɐɯɯoɔ sᴉɥ┴
+
+velocity.command.players-only=Only players can run this command.
+velocity.command.server-does-not-exist=˙puɐɯɯoɔ sᴉɥʇ unɹ uɐɔ sɹǝʎɐld ʎluO
+
+velocity.command.server-current-server=˙{0} oʇ pǝʇɔǝuuoɔ ʎlʇuǝɹɹnɔ ǝɹɐ no⅄
+velocity.command.server-too-many=˙sʇunoɔ ɹǝʌɹǝs lɐnpᴉʌᴉpuᴉ ʇǝƃ oʇ uoᴉʇǝldɯoɔ qɐʇ ǝs∩ ˙dn ʇǝs sɹǝʌɹǝs ʎuɐɯ ooʇ ǝɹɐ ǝɹǝɥ┴
+velocity.command.server-available=:sɹǝʌɹǝs ǝlqɐlᴉɐʌ∀
+velocity.command.server-tooltip-player-online=ǝuᴉluo ɹǝʎɐld {0}
+velocity.command.server-tooltip-players-online=ǝuᴉluo sɹǝʎɐld {0}
+velocity.command.server-tooltip-current-server=ɹǝʌɹǝs sᴉɥʇ oʇ pǝʇɔǝuuoɔ ʎlʇuǝɹɹnƆ
+velocity.command.server-tooltip-offer-connect-server=ɹǝʌɹǝs sᴉɥʇ oʇ ʇɔǝuuoɔ oʇ ʞɔᴉlƆ
+
+velocity.command.glist-player-singular=ɹǝʎɐld
+velocity.command.glist-player-plural=sɹǝʎɐld
+velocity.command.glist-total-suffix=˙ʎxoɹd ǝɥʇ oʇ pǝʇɔǝuuoɔ ʎlʇuǝɹɹnɔ ǝɹɐ 
+velocity.command.glist-view-all=˙/glist all ǝsn 'sɹǝʌɹǝs uo sɹǝʎɐld llɐ ʍǝᴉʌ o┴
+
+velocity.command.reload-success=˙pǝpɐolǝɹ ʎllnɟssǝɔɔns uoᴉʇɐɹnƃᴉɟuoɔ ʎʇᴉɔolǝΛ
+velocity.command.reload-failure=˙slᴉɐʇǝp ǝɹoɯ ɹoɟ ǝlosuoɔ ǝɥʇ ʞɔǝɥƆ ˙uoᴉʇɐɹnƃᴉɟuoɔ ʎʇᴉɔolǝΛ ɹnoʎ pɐolǝɹ oʇ ǝlqɐu∩
+
+velocity.command.version-copyright=˙Ɛʌ ǝsuǝɔᴉ˥ ɔᴉlqnԀ lɐɹǝuǝפ ∩Nפ ǝɥʇ ɟo sɯɹǝʇ ǝɥʇ ɹǝpun pǝsuǝɔᴉl sᴉ {1} ˙{0} Ɩᄅ0ᄅ-8Ɩ0ᄅ ʇɥƃᴉɹʎdoƆ
+
+velocity.command.no-plugins=˙pǝllɐʇsuᴉ ʎlʇuǝɹɹnɔ suᴉƃnld ou ǝɹɐ ǝɹǝɥ┴
+velocity.command.plugins-list={0}: suᴉƃnlԀ
+velocity.command.plugin-tooltip-website={0}: ǝʇᴉsqǝM
+velocity.command.plugin-tooltip-author={0}: ɹoɥʇn∀
+velocity.command.plugin-tooltip-authors={0}: sɹoɥʇn∀