Change capitalization for koi, olo, and vro

Corresponds to MediaWiki change:
https://gerrit.wikimedia.org/r/c/mediawiki/core/+/648536

data/langdb.yaml

@@ -311,7 +311,7 @@ languages:
   ko-kp: [Kore, [AS], 조선말]
  # Kore is an alias for Hangul+Han. Maybe Hang is more appropriate?
   ko: [Kore, [AS], 한국어]
-  koi: [Cyrl, [EU], Перем Коми]
+  koi: [Cyrl, [EU], перем коми]
   koy: [Latn, [AM], "Denaakkenaageʼ"]
   kr: [Latn, [AF], Kanuri]
   krc: [Cyrl, [EU], къарачай-малкъар]
@@ -432,7 +432,7 @@ languages:
   nys: [Latn, [PA], Nyungar]
   oc: [Latn, [EU], occitan]
   oka: [Latn, [AM], n̓səl̓xcin̓]
-  olo: [Latn, [AS, EU], Livvinkarjala]
+  olo: [Latn, [AS, EU], livvinkarjala]
   om: [Latn, [AF], Oromoo]
   ood: [Latn, [AM], "ʼOʼodham ha-ñeʼokĭ"]
   or: [Orya, [AS], ଓଡ଼ିଆ]
@@ -622,7 +622,7 @@ languages:
   vmf: [Latn, [EU], Mainfränkisch]
   vo: [Latn, [WW], Volapük]
   vot: [Latn, [EU], Vaďďa]
-  vro: [Latn, [EU], Võro]
+  vro: [Latn, [EU], võro]
   wa: [Latn, [EU], walon]
   war: [Latn, [AS], Winaray]
   wls: [Latn, [PA], "Faka'uvea"]

data/language-data.json

@@ -1968,7 +1968,7 @@
             [
                 "EU"
             ],
-            "Перем Коми"
+            "перем коми"
         ],
         "koy": [
             "Latn",
@@ -2786,7 +2786,7 @@
                 "AS",
                 "EU"
             ],
-            "Livvinkarjala"
+            "livvinkarjala"
         ],
         "om": [
             "Latn",
@@ -4034,7 +4034,7 @@
             [
                 "EU"
             ],
-            "Võro"
+            "võro"
         ],
         "wa": [
             "Latn",