Language field corrected

To match filename

Author: Chris Jakeman

Source/Locales/Menu/pt-PT.po

@@ -5,7 +5,7 @@ msgstr ""
 "PO-Revision-Date: 2021-05-06 00:16+0100\n"
 "Last-Translator: Rui Fonseca <ryfonseca77@gmail.com>\n"
 "Language-Team: \n"
-"Language: pt_PT\n"
+"Language: pt-PT\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

Source/Locales/ORTS.Menu/pt-PT.po

@@ -5,7 +5,7 @@ msgstr ""
 "PO-Revision-Date: 2025-01-12 22:34+0000\n"
 "Last-Translator: Rui Fonseca <ryfonseca77@gmail.com>\n"
 "Language-Team: Rui Fonseca\n"
-"Language: pt_PT\n"
+"Language: pt-PT\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

Source/Locales/Orts.Formats.OR/pt-PT.po

@@ -5,7 +5,7 @@ msgstr ""
 "PO-Revision-Date: 2025-01-05 01:36+0000\n"
 "Last-Translator: \n"
 "Language-Team: Rui Fonseca\n"
-"Language: pt_PT\n"
+"Language: pt-PT\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

Source/Locales/Orts.Simulation/pt-PT.po

@@ -5,7 +5,7 @@ msgstr ""
 "PO-Revision-Date: 2025-01-05 01:38+0000\n"
 "Last-Translator: \n"
 "Language-Team: Rui Fonseca\n"
-"Language: pt_PT\n"
+"Language: pt-PT\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

Source/Locales/Updater/pt-PT.po

@@ -5,7 +5,7 @@ msgstr ""
 "PO-Revision-Date: 2025-01-05 01:39+0000\n"
 "Last-Translator: \n"
 "Language-Team: Rui Fonseca\n"
-"Language: pt_PT\n"
+"Language: pt-PT\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"