Add lint.xml and add ignores to it (#2300)

It's more expandable later on this way.

Author: Luna712

app/build.gradle.kts

@@ -145,7 +145,6 @@ android {
     lint {
         abortOnError = false
         checkReleaseBuilds = false
-        disable.add("MissingTranslation")
     }
 
     buildFeatures {

app/lint.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<lint>
+    <!-- ByteOrderMark has errors in values-b+ja/strings.xml, but it's handled by weblate so we don't really care. -->
+    <issue id="ByteOrderMark" severity="ignore" />
+
+    <!-- We don't care about MissingTranslation since it's handled by weblate. -->
+    <issue id="MissingTranslation" severity="ignore" />
+</lint>