[fix] bing-news engine: language support (by bing-news market code)

- bing-news uses market codes / see query-parameter 'mkt' at [1]:

  The market must be in the form <language>-<country/region>.
  ...
  If known, you are encouraged to always specify the market. Specifying the
  market helps Bing route the request and return an appropriate and optimal
  response. If you specify a market that is not listed in Market codes, Bing
  uses a best fit market code based on an internal mapping that is subject to
  change.

- fech market codes from [2]

[1] https://docs.microsoft.com/en-us/bing/search-apis/bing-news-search/reference/query-parameters
[2] https://docs.microsoft.com/en-us/bing/search-apis/bing-news-search/reference/market-codes

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/data/engines_languages.json

@@ -204,106 +204,44 @@
     "zu"
   ],
   "bing news": [
-    "af",
-    "am",
-    "ar",
-    "as",
-    "az",
-    "be",
-    "bg",
-    "bn",
-    "bs",
-    "ca",
-    "chr",
-    "cs",
-    "cy",
-    "da",
-    "de",
-    "el",
-    "en",
-    "es",
-    "et",
-    "eu",
-    "fa",
-    "fi",
-    "fil",
-    "fr",
-    "ga",
-    "gd",
-    "gl",
-    "gu",
-    "ha",
-    "he",
-    "hi",
-    "hr",
-    "hu",
-    "hy",
-    "id",
-    "ig",
-    "is",
-    "it",
-    "ja",
-    "ka",
-    "kk",
-    "km",
-    "kn",
-    "ko",
-    "kok",
-    "ku",
-    "ky",
-    "lb",
-    "lo",
-    "lt",
-    "lv",
-    "mi",
-    "mk",
-    "ml",
-    "mn",
-    "mr",
-    "ms",
-    "mt",
-    "nb",
-    "ne",
-    "nl",
-    "nn",
-    "nso",
-    "or",
-    "pa",
-    "pl",
-    "prs",
-    "pt",
-    "quc",
-    "quz",
-    "ro",
-    "ru",
-    "rw",
-    "sd",
-    "si",
-    "sk",
-    "sl",
-    "sq",
-    "sr",
-    "sv",
-    "sw",
-    "ta",
-    "te",
-    "tg",
-    "th",
-    "ti",
-    "tk",
-    "tn",
-    "tr",
-    "tt",
-    "ug",
-    "uk",
-    "ur",
-    "uz",
-    "vi",
-    "wo",
-    "xh",
-    "yo",
-    "zh",
-    "zu"
+    "da-DK",
+    "de-AT",
+    "de-CH",
+    "de-DE",
+    "en-AU",
+    "en-CA",
+    "en-GB",
+    "en-ID",
+    "en-IN",
+    "en-MY",
+    "en-NZ",
+    "en-PH",
+    "en-US",
+    "en-ZA",
+    "es-AR",
+    "es-CL",
+    "es-ES",
+    "es-MX",
+    "es-US",
+    "fi-FI",
+    "fr-BE",
+    "fr-CA",
+    "fr-CH",
+    "fr-FR",
+    "it-IT",
+    "ja-JP",
+    "ko-KR",
+    "nl-BE",
+    "nl-NL",
+    "no-NO",
+    "pl-PL",
+    "pt-BR",
+    "ru-RU",
+    "sv-SE",
+    "tr-TR",
+    "zh-CN",
+    "zh-HK",
+    "zh-TW"
   ],
   "bing videos": [
     "af",