Update HMCL/src/main/resources/assets/lang/I18N.properties

Co-authored-by: 3gf8jv4dv <3gf8jv4dv@gmail.com>

Author: zkitefly

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -1165,9 +1165,9 @@ mods.export.field.curseforge_file_url=CurseForge File URL
 mods.export.field.curseforge_download_page=CurseForge Download Page
 mods.export.field.modrinth_url=Modrinth URL
 mods.export.field.modrinth_file_url=Modrinth File URL
-extension.csv=CSV Files
-extension.json=JSON Files
-extension.txt=Text Files
+extension.csv=CSV File
+extension.json=JSON File
+extension.txt=Text File
 button.export=Export
 mods.unknown=Unknown Mod