Yes, the problem is that it doesn't work like it, you can make the test changing the language preferred in your navigator (remember only IExplorer): 
(Tools >> Internet options... >> General, Languages) 
The editor contains a page with the translation to the following languages: 
Norwegian, German, French, Spanish (es-mx) and finally my translation to Spanish (es-es). (I attached this file). 
Naturally if you use Moodle in a site in which will only use a language, it is easy to make that the RichTextEditor offers its interface in that language, it is only necessary to change the line number 100 in rte_lang.js: 
  lang = locale["en-us"]; 
 
But to me, it interests me that it works in 3 languages  
 
Regarding the " Styles ", yes, indeed, those headed are there, but they don't work. In the file rte_interface.js are disabled: 
// Define the default style list 
 this.styleList = [ 
  // element  description   Active 
  [null,   "Normal",   0], 
  [null,   "Heading 1",  0], 
  [null,   "Heading 2",  0], 
  [null,   "Heading 3",  0], 
  [null,   "Heading 4",  0], 
  [null,   "Heading 5",  0], 
  [null,   "Heading 6",  0], 
  [null,   "Address",   0], 
  [null,   "Formatted",  0], 
  ["BLOCKQUOTE", "Blockquote",  0], 
  ["CITE",  "Citation",   0], 
  ["BDO",   "Reversed",   0], 
  ["BIG",   "Big",    0], 
  ["SMALL",  "Small",   0], 
  ["DIV",   "Div",    0], 
  ["SUP",   "Superscript",  0], 
  ["SUB",   "Subscript",  0] 
 ]; 
 
Try to introduce an H2 in your answer message in this forum and you will see that it is impossible. Would somebody know how to fix this?

thanks in advance