MD5 verification sanity

We can use switches and enums to make things more understandable
and work with results in a more sensible manner.

PS2: Move file MD5 verification and error handling into
     a separate function to reduce code.

PS3: Default to false in Check_Restore_File_MD5 function

Change-Id: Id3ee0bb444cf13be67bb5dec2c43f7c26a86b954
(cherry picked from commit 5c3950716e5c7c6279efd5f3f338d6d22e5215e2)
diff --git a/gui/theme/common/languages/cz.xml b/gui/theme/common/languages/cz.xml
index 9d6ade6..83cd0b2 100644
--- a/gui/theme/common/languages/cz.xml
+++ b/gui/theme/common/languages/cz.xml
@@ -542,6 +542,7 @@
 		<string name="unable_resize">Nelze natáhnout {1}.</string>
 		<string name="no_md5_found">Soubor MD5 se nenašel pro \'{1}\'. Prosím zvolte Vypnout kontrolu MD5 během obnovy.</string>
 		<string name="md5_fail_match">MD5 neodpovídá souboru \'{1}\'.</string>
+		<string name="md5_matched">MD5 matched for '{1}'.</string>
 		<string name="fail_decrypt_tar">Nelze dešifrovat soubor tar \'{1}\'</string>
 		<string name="format_data_msg">Měli by jste restartovat recovery aby jste mohli znova používat /data.</string>
 		<string name="format_data_err">Nelze formátovat pro zrušení šifrování.</string>