convert list to Dataframe

txt <- system.file("texts", "txt", package = "tm")
(twitter <- Corpus(DirSource(txt),

Hi. I have a huge list called twitter:

dim(twitter)

NULL

str(twitter)

List of 1
 $ :Classes 'PlainTextDocument', 'TextDocument', 'character'  atomic
[1:35575] 11999;10:47:14;20;10;2009;ObamaLouverture;Trails Mixed Lessons
For Governance From Campaigner-in-chief: President obama jumps  campaign
09  tuesday.. http://bit.ly/2eHMaN;Florida;USA;FL;;;27.6648274;-81.5157535
12210;10:47:37;20;10;2009;David_Stringer;William Hague heading  Washington 
meets  Gen. Jim Jones, Sen. John McCain  others. Will Obama team raise
worries  EU ties?;London, England;United Kingdom;Greater
London;Westminster;;51.5001524;-0.1262362
12355;10:47:53;20;10;2009;Singsabit;RT @Drudge_Report PAPER: Excuses
wearing thin  Obama, media pals... http://tinyurl.com/yfw6cd9;So.
California;USA;CA;;;36.778261;-119.4179324
12407;10:47:59;20;10;2009;obamavideonews;Obama News Obama   Afghanistan
troop decision timing (AFP) : AFP - Pres.. http://bit.ly/3KPUr8 #obama
#video;USA;USA;;;;37.09024;-95.712891 ...
  .. ..- attr(*, "Author")= chr(0) 
  .. ..- attr(*, "DateTimeStamp")= POSIXlt[1:9], format: "2009-10-31
04:46:56"
  .. ..- attr(*, "Description")= chr(0) 
  .. ..- attr(*, "Heading")= chr(0) 
  .. ..- attr(*, "ID")= chr "1"
  .. ..- attr(*, "Language")= chr "en"
  .. ..- attr(*, "LocalMetaData")= list()
  .. ..- attr(*, "Origin")= chr(0) 
 - attr(*, "CMetaData")=List of 3
  ..$ NodeID  : num 0
  ..$ MetaData:List of 2
  .. ..$ create_date: POSIXlt[1:9], format: "2009-10-31 04:46:56"
  .. ..$ creator    : Named chr ""
  .. .. ..- attr(*, "names")= chr "LOGNAME"
  ..$ Children: NULL
  ..- attr(*, "class")= chr "MetaDataNode"
 - attr(*, "DMetaData")='data.frame':   1 obs. of  1 variable:
  ..$ MetaID: num 0
 - attr(*, "class")= chr [1:3] "VCorpus" "Corpus" "list"

It contains tweets but in many languages. The "columns" are separated by
semi-colons. I am using the tm package and it is a "corpus".

It looks like this:

547282;06:37:17;21;10;2009;dani_jade18;@Laura_Whyte1   day
:p;Huddersfield/Lincoln;United
Kingdom;Kirklees;Kirklees;;53.6468475;-1.7727296
547283;06:37:17;21;10;2009;fabiomafra;algu?m traz mais lenha pro
computador da facool? BOM DIA.;Belo Horizonte - MG -
BR;Brazil;MG;;;-19.8157306;-43.9542226
547284;06:37:17;21;10;2009;romanotr;???, "????????? ??? ??????"
???????????? ?????? ????? ?? ???????? ?????, ?? 173 ?????? ?? 81 ?????
???????? ???????. ??????,??????...;Portugal
Aveiro;Portugal;Aveiro;;;40.6411848;-8.6536169
547285;06:37:18;21;10;2009;Y_T_;Playing: Beth Orton &lt\;Someone's
Daughter&gt\;;Kanazawa, Japan;Japan;Ishikawa
Prefecture;;;36.5613254;136.6562051
Error: invalid input
'547286;06:37:18;21;10;2009;Atogey;????????????????????????????????????????????????????????????????????????RT
@zuola ???????????? @wenyunc

I want to convert it to "fields" or columns and so I thought I should
convert it to a dataframe. I tried

twitterDF<-as.data.frame(twitter)

Error in sort.list(y) : 
  invalid input
'547286;06:37:18;21;10;2009;Atogey;????????????????????????????????????????????????????????????????????????RT
@zuola ???????????? @wenyunchao
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????*????????????????????????????????????????????????????????????????????????????????????;???????????????;China;Zhejiang;;;28.695035;119.751054'
in 'utf8towcs'

Can anyone suggest what I can do? 

P.S. Actually, I would love to remove all the non-English tweets but I
have no clue about how to do that.