Rewrite "Interface preferences displays self-names of languages" ...

See original attempt at commit 7ec5fd79df

This eliminates the need for a resource file at run-time.

locale/LanguageNames.txt is intended as a "source file" that is infrequently
changed as the set of supported languages changes.

The intermediate step, of appropriately copying that file into the C++ source
code in src/Languages.cpp, was done by hand.

In XCode, I set locale/LanguagesNames.txt and src/Languages.cpp to be
interpreted as Western encoding, and then the copy-paste was easy in the
editor.

The resulting C++ source code file now has string literals that are not 7-bit
ASCII.

locale/LanguageNames.txt

@@ -1,56 +1,59 @@
-af Afrikaans
-ar العربية
-be Беларуская
-bg Български
-bn বাংলা
-bs Bosanski
-ca Català
-ca_ES@valencia Valencià
-cs Čeština
-cy Cymraeg
-da Dansk
-de Deutsch
-el Ελληνικά
-en English
-es Español
-eu Euskara
-eu_ES Euskara (Espainiako)
-fa فارسی
-fi Suomi
-fr Français
-ga Gaeilge
-gl Galego
-he עברית
-hi हिन्दी
-hr Hrvatski
-hu Magyar
-hy Հայերեն
-id Bahasa Indonesia
-it Italiano
-ja 日本語
-ka ქართული
-km ខេមរភាសា
-ko 한국어
-lt Lietuvių
-mk Македонски
-my မြန်မာစာ
-nb Norsk
-nl Nederlands
-oc Occitan
-pl Polski
-pt Português
-pt_BR Português (Brasil)
-ro Română
-ru Русский
-sk Slovenčina
-sl Slovenščina
-sr_RS Српски
-sr_RS@latin Srpski
-sv Svenska
-ta தமிழ்
-tg Тоҷикӣ
-tr Türkçe
-uk Українська
-vi Tiếng Việt
-zh_CN 中文
-zh_TW 中文
+// To edit this file, open as UTF-8 encoded Unicode
+// To use the updated file, open as 8-bit ASCII, copy the strings, and paste
+// over the table of names in src/Languages.cpp
+"af Afrikaans",
+"ar العربية",
+"be Беларуская",
+"bg Български",
+"bn বাংলা",
+"bs Bosanski",
+"ca Català",
+"ca_ES@valencia Valencià",
+"cs Čeština",
+"cy Cymraeg",
+"da Dansk",
+"de Deutsch",
+"el Ελληνικά",
+"en English",
+"es Español",
+"eu Euskara",
+"eu_ES Euskara (Espainiako)",
+"fa فارسی",
+"fi Suomi",
+"fr Français",
+"ga Gaeilge",
+"gl Galego",
+"he עברית",
+"hi हिन्दी",
+"hr Hrvatski",
+"hu Magyar",
+"hy Հայերեն",
+"id Bahasa Indonesia",
+"it Italiano",
+"ja 日本語",
+"ka ქართული",
+"km ខេមរភាសា",
+"ko 한국어",
+"lt Lietuvių",
+"mk Македонски",
+"my မြန်မာစာ",
+"nb Norsk",
+"nl Nederlands",
+"oc Occitan",
+"pl Polski",
+"pt Português",
+"pt_BR Português (Brasil)",
+"ro Română",
+"ru Русский",
+"sk Slovenčina",
+"sl Slovenščina",
+"sr_RS Српски",
+"sr_RS@latin Srpski",
+"sv Svenska",
+"ta தமிழ்",
+"tg Тоҷикӣ",
+"tr Türkçe",
+"uk Українська",
+"vi Tiếng Việt",
+"zh_CN 中文",
+"zh_TW 中文",