Background
----------
No previous updates for this.
 Description :
The GNU recode utility converts files between various character sets.
 $ urpmq --whatrequires-recursive recode | sort | uniq
dropbox-servicemenu

So it looks as if 'dropbox-servicemenu' is the only hosting application.
However, there is a 'recode' binary, with man page, which perhaps we can use. More  detail in its 'info' which includes: Quick Tutorial.

I could find no test example (PoC).

CC: (none) => lewyssmith

MGA-32 on Asus A6000VM Xfce
No installation issues
Googled and found some help in https://superuser.com/questions/116907/how-to-recode-to-utf-8-conditionally
So at CLI:
$ recode -l
/21-Permutation swabytes
/4321-Permutation
/Base64 64 b64
/CR
/CR-LF cl
and loads more. Further, first make a copy of your test file as recode overwrites it:
$ file -bi bookmark.htm         
text/html; charset=iso-8859-1
$ recode ISO-8859-1..UTF-8 bookmark.htm 
does not give any feedback
$ file -bi bookmark.htm 
text/html; charset=utf-8
Seems to work OK

CC: (none) => herman.viaene
Whiteboard: MGA5TOO => MGA5TOO MGA5-32-OK

mga6::x86_64

Seems to work here also.
Updated the packages.

$ cat transcoded.txt
R�sum�
$ file -i transcoded.txt
transcoded.txt: text/plain; charset=iso-8859-1

$ recode iso-8859-1..utf-8 transcoded.txt
$ cat transcoded.txt
Résumé
$ file -i transcoded.txt
transcoded.txt: text/plain; charset=utf-8

$ recode us-ascii..wchar-t brillig
$ file -i brillig
brillig: application/octet-stream; charset=binary
$ cat brillig
"\n\x00\x00\x00-\x00\x00\x00-\x00\x00\x00-\x00\x00\x00-\x00\x00\x00-\x00\x00\x00
...........................
$ recode wchar-t..utf-8 brillig
$ cat brillig

------------------------------------------
|                                        |
|  Twas brillig and the slithy toves     |
|  Did gyre and and gimble in the wabe.  |
|  All mimsy were the borogoves          |
|  And the mome raths outgrabe.          |
|                                        |
------------------------------------------

CC: (none) => tarazed25

mga5::x86_64

$ cat t1.rb
string = "R\u00E9sum\u00E9 "
open( "transcoded.txt", "w:ISO-8859-1" ) do |io|
  io.write(string)
end
$ ruby t1.rb
$ cat transcoded.txt 
R�sum� 
$ file -i transcoded.txt
transcoded.txt: text/plain; charset=iso-8859-1
$ cat transcoded.txt
Résumé 
$ file -i transcoded.txt
transcoded.txt: text/plain; charset=utf-8

$ file -i ozymandias
ozymandias: text/plain; charset=utf-8
$ recode utf-8..wchar-t ozymandias
$ file -i ozymandias
ozymandias: application/octet-stream; charset=binary
$ less ozymandias
................
^@h^@^@^@e^@^@^@s^@^@^@e^@^@^@ ^@^@^@w^@^@^@o^@^@^@r^@^@^@d^@^@^@s^@^@^@ ^@^@^@a^@^@^@p^@^@^@p^@^@^@e^@^@^@a^@^@^@r^@^@^@:^@^@^@
$ recode wchar-t..us-ascii ozymandias
$ file -i ozymandias
ozymandias: text/plain; charset=us-ascii
$ cat ozymandias
............
My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
Nothing beside remains.  Round the decay
Of that colossal Wreck, boundless and bare
The lone and level sands stretch far away."

Good for mga5 64-bits.

Oops.  Left out a line in the report in comment 4.

$ recode iso-8859-1..utf-8 transcoded.txt
before
$ cat transcoded.txt
Résumé

That last report about the wide character conversion is misleading.  I somehow mixed up the before test output with the final report.  After the update the output text can be read - it looks like the original.
$ file -i brillig
brillig: text/plain; charset=us-ascii
$ recode -v us-ascii..wchar_t brillig
Request: ANSI_X3.4-1968..:libiconv:..WCHAR_T
Shrunk to: ANSI_X3.4-1968..WCHAR_T
Recoding brillig... done
$ file -i brillig
brillig: application/octet-stream; charset=binary
The file reads as plain text but a hexdump shows that wide characters have been implemented.
$ hexdump brillig
0000000 002d 0000 002d 0000 002d 0000 002d 0000
*
00000a0 002d 0000 002d 0000 000a 0000 007c 0000
00000b0 0020 0000 0020 0000 0020 0000 0020 0000
*
...................
$ recode wchar_t..utf-8 brillig
$ file -i brillig
brillig: text/plain; charset=us-ascii
$ hexdump brillig
0000000 2d2d 2d2d 2d2d 2d2d 2d2d 2d2d 2d2d 2d2d
*
0000020 2d2d 2d2d 2d2d 2d2d 2d2d 7c0a 2020 2020
0000030 2020 2020 2020 2020 2020 2020 2020 2020
*
0000050 2020 2020 0a7c 207c 5420 6177 2073 7262

So it does work but you no longer see binary characters in the listing.

Redface again: less shows binary characters, cat suppresses them, zeroes anyway.
Sorry for the noise.

An update for this issue has been pushed to the Mageia Updates repository.

https://advisories.mageia.org/MGASA-2017-0385.html

Resolution: (none) => FIXED
Status: NEW => RESOLVED