[chore] update viper version (#2539)

* update viper version

* removes our last uses of the slice package

* fix tests

vendor/github.com/sagikazarmark/locafero/helpers.go

@@ -0,0 +1,41 @@
+package locafero
+
+import "fmt"
+
+// NameWithExtensions creates a list of names from a base name and a list of extensions.
+//
+// TODO: find a better name for this function.
+func NameWithExtensions(baseName string, extensions ...string) []string {
+	var names []string
+
+	if baseName == "" {
+		return names
+	}
+
+	for _, ext := range extensions {
+		if ext == "" {
+			continue
+		}
+
+		names = append(names, fmt.Sprintf("%s.%s", baseName, ext))
+	}
+
+	return names
+}
+
+// NameWithOptionalExtensions creates a list of names from a base name and a list of extensions,
+// plus it adds the base name (without any extensions) to the end of the list.
+//
+// TODO: find a better name for this function.
+func NameWithOptionalExtensions(baseName string, extensions ...string) []string {
+	var names []string
+
+	if baseName == "" {
+		return names
+	}
+
+	names = NameWithExtensions(baseName, extensions...)
+	names = append(names, baseName)
+
+	return names
+}