Minor cleanup of the repo (#822)

* *: source files should not be executable

* *: make sure files have final newline

* *: remove BOM from text files

* translations: unify headers

* *: fix typos

* *: trim excess whitespace

doc/html/How to Back Up Securely.html

@@ -10,7 +10,7 @@
 </head>
 <body>
 
-<div>                      
+<div>
 <a href="https://www.veracrypt.fr/en/Home.html"><img src="VeraCrypt128x128.png" alt="VeraCrypt"/></a>
 </div>
 
@@ -27,7 +27,7 @@
 
 <div>
 <p>
-<a href="Documentation.html">Documentation</a>           
+<a href="Documentation.html">Documentation</a>
 <img src="arrow_right.gif" alt=">>" style="margin-top: 5px">
 <a href="How%20to%20Back%20Up%20Securely.html">How to Back Up Securely</a>
 </p></div>
@@ -109,4 +109,4 @@ If the operating system that you want to back up is installed in a hidden VeraCr
  algorithm and the algorithm is later broken (for example, due to advances in cryptanalysis), the attacker might be able to decrypt his copies of the volume. The probability that three distinct encryption algorithms will be broken is significantly lower than
  the probability that only one of them will be broken.</p>
 </div>
-</div><div class="ClearBoth"></div></body></html>
+</div><div class="ClearBoth"></div></body></html>