[fix] get common used languages back (min_engines_per_lang = 13)

In commit 4d3f2f48d common used languages has been droped.  By reducing the
number of `min_engines_per_lang` from 15 to 13 we get theses languages back.

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

searx/languages.py

@@ -2,7 +2,9 @@
 # list of language codes
 # this file is generated automatically by utils/fetch_languages.py
 language_codes = \
-(   ('ar-EG', 'العربية', '', 'Arabic'),
+(   ('af-ZA', 'Afrikaans', '', 'Afrikaans'),
+    ('ar-EG', 'العربية', '', 'Arabic'),
+    ('be-BY', 'Беларуская', '', 'Belarusian'),
     ('bg-BG', 'Български', '', 'Bulgarian'),
     ('ca-ES', 'Català', '', 'Catalan'),
     ('cs-CZ', 'Čeština', '', 'Czech'),
@@ -26,6 +28,7 @@ language_codes = \
     ('es-ES', 'Español', 'España', 'Spanish'),
     ('es-MX', 'Español', 'México', 'Spanish'),
     ('et-EE', 'Eesti', '', 'Estonian'),
+    ('fa-IR', 'فارسی', '', 'Persian'),
     ('fi-FI', 'Suomi', '', 'Finnish'),
     ('fr', 'Français', '', 'French'),
     ('fr-BE', 'Français', 'Belgique', 'French'),
@@ -36,6 +39,7 @@ language_codes = \
     ('hr-HR', 'Hrvatski', '', 'Croatian'),
     ('hu-HU', 'Magyar', '', 'Hungarian'),
     ('id-ID', 'Indonesia', '', 'Indonesian'),
+    ('is-IS', 'Íslenska', '', 'Icelandic'),
     ('it-IT', 'Italiano', '', 'Italian'),
     ('ja-JP', '日本語', '', 'Japanese'),
     ('ko-KR', '한국어', '', 'Korean'),
@@ -53,9 +57,12 @@ language_codes = \
     ('ru-RU', 'Русский', '', 'Russian'),
     ('sk-SK', 'Slovenčina', '', 'Slovak'),
     ('sl-SI', 'Slovenščina', '', 'Slovenian'),
+    ('sr-RS', 'Srpski', '', 'Serbian'),
     ('sv-SE', 'Svenska', '', 'Swedish'),
+    ('sw-TZ', 'Kiswahili', '', 'Swahili'),
     ('th-TH', 'ไทย', '', 'Thai'),
     ('tr-TR', 'Türkçe', '', 'Turkish'),
+    ('uk-UA', 'Українська', '', 'Ukrainian'),
     ('vi-VN', 'Tiếng Việt', '', 'Vietnamese'),
     ('zh', '中文', '', 'Chinese'),
     ('zh-CN', '中文', '中国', 'Chinese'),

searx_extra/update/update_languages.py

@@ -109,7 +109,7 @@ def join_language_lists(engines_languages):
 
 # Filter language list so it only includes the most supported languages and countries
 def filter_language_list(all_languages):
-    min_engines_per_lang = 15
+    min_engines_per_lang = 13
     min_engines_per_country = 10
     main_engines = [engine_name for engine_name in engines.keys()
                     if 'general' in engines[engine_name].categories and