fix nits; rename transifex-client to Transifex Client

Author: shimizukawa

doc/basic.rst

@@ -13,7 +13,7 @@ Basic Features
 
 Optional features
 ==================
-These features depends on the `transifex-client`_ tool.
+These features depends on the `Transifex Client`_ tool.
 Please refer Installation_ section to install it.
 
 * create ``.transifexrc`` file from environment variable, without interactive