Add Siriono (srq) and update Cape Verdean (kea) capitalization

See downstream task:
https://phabricator.wikimedia.org/T284870

Siriono (srq) autonym verified in
Gasparini, Noé; Dicarere Mendez, Victor Hugo (2015).
Diccionario sirionó: sirionó - castellano - inglés y castellano - sirionó

data/langdb.yaml

@@ -296,7 +296,7 @@ languages:
   kbd: [Cyrl, [EU, ME], Адыгэбзэ]
   kbp: [Latn, [AF], Kabɩyɛ]
   kcg: [Latn, [AF], Tyap]
-  kea: [Latn, [AF], Kabuverdianu]
+  kea: [Latn, [AF], kabuverdianu]
   kg: [Latn, [AF], Kongo]
   kgp: [Latn, [AM], Kaingáng]
   khw: [Arab, [ME, AS], کھوار]
@@ -552,6 +552,7 @@ languages:
   sly: [Latn, [AS], Bahasa Selayar]
   skr-arab: [Arab, [AS], سرائیکی]
   skr: [skr-arab]
+  srq: [Latn, [AM], mbia cheë]
   syc: [Syrc, [ME], ܣܘܪܝܝܐ]
   syl: [Sylo, [AS], ꠍꠤꠟꠐꠤ]
   syl-beng: [Beng, [AS], সিলেটি]

data/language-data.json

@@ -1879,7 +1879,7 @@
             [
                 "AF"
             ],
-            "Kabuverdianu"
+            "kabuverdianu"
         ],
         "kg": [
             "Latn",
@@ -3570,6 +3570,13 @@
         "skr": [
             "skr-arab"
         ],
+        "srq": [
+            "Latn",
+            [
+                "AM"
+            ],
+            "mbia cheë"
+        ],
         "syc": [
             "Syrc",
             [