Question Kunena 3.0.3: Upload files and warnings

Good day!
I use Kunena 3.0.3 ( with Russian language pack ), Joomla 2.5.16 . This version of Kunena can not upload files and avatars that contain Russian letters .
1. If Russian letters are in name of avatar , a warning is given that the file extension is invalid, but it is allowed!
2 . If you have Russian letters in the file name , which is attached to the message , the file is attached , but do not have a name . After downloading the file it will not open , and most users will not guess give it a name .
3 . If avatar size larger than the size that is specified in the admin panel , the user is not given any warning and avatar does not boot .

Please tell me whether you can make any changes to files Kunena, the user sees warning that:
1. avatar much weight and should weigh no more than xxx KB.
2 . avatar or image should not contain Russian letters (do not download the file without a name, but only to warn ) .

I'm not a programmer and of all written itself can only add a constant in the language pack and translate them . So please help!

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Kunena menu details:

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ID	Name	Menutype	Link	Path
304	Форум	mainmenu	Itemid=295	kunena-forum
295	Форум	kunenamenu	view=home&defaultmenu=297	forum
296	Оглавление	kunenamenu	view=category&layout=list	forum/index
297	Последнее	kunenamenu	view=topics&mode=replies	forum/recent
298	Новая тема	kunenamenu	view=topic&layout=create	forum/newtopic
299	Без ответов	kunenamenu	view=topics&mode=noreplies	forum/noreplies
300	Мои темы	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest
301	Профиль	kunenamenu	view=user	forum/profile
302	Помощь	kunenamenu	view=misc	forum/help
303	Поиск	kunenamenu	view=search	forum/search

Joomla default template details : site | author: site.ru | version: 1.0.0 | creationdate: Unknown

Kunena default template details : Blue Eagle | author: Kunena Team | version: 3.0.3 | creationdate: 2013-10-20

Kunena version detailed: Kunena 3.0.3 | 2013-10-20 [ Bifrost ]
| Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	0
threads_per_page	20
messages_per_page	15
messages_per_page_search	20
showhistory	1
historylimit	5
shownew	1
disemoticons	0
template	blue_eagle
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	0
useredit	1
useredittime	1200
useredittimegrace	1200
editmarkup	1
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maxsubject	60
maxsig	50
regonly	0
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allowavatarupload	1
allowavatargallery	1
avatarquality	80
avatarsize	200
imageheight	800
imagewidth	800
imagesize	150
filetypes	doc,docx,txt,rtf,pdf,zip,rar,tar.gz,tgz,tar.bz2
filesize	300
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
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userlist_posts	1
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trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
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ebaylanguagecode	en-us
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rss_type	topic
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rss_excluded_categories
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ordering_system	replyid
post_dateformat	datetime
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hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	64
thumbwidth	64
hideuserprofileinfo	put_empty
boxghostmessage	0
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latestcategory_in	1
topicicons	1
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email_recipient_privacy	bcc
captcha_post_limit	0
keywords	0
userkeywords	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts	1
hold_guest_posts	1
attachment_limit	8
pickup_category	1
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	180
iptracking	1
rss_feedburner_url
autolink	1
access_component	1

| Kunena integration settings:

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Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Enabled: private=1

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (United Kingdom)
ru-RU	Russian

Third-party components: CommunityBuilder 1.9.1

Third-party SEF components: None

Plugins: Search - Kunena Search 3.0.1 | Content - Kunena Discuss 3.0.1

Modules: Kunena Latest 3.0.1 | Kunena Login 3.0.1 | Kunena Search 3.0.1

I also try to solve this problem on my forum. It is known that Kunena version 2.0.2 did not have this issue.

We have previously requested to correct this issue. In 2.0.x Kunena team fixed it. But in version 3.0.x this problem appeared again.

I am sure that this issue applies not only to the Russian letters. But to many unicode characters.

In 2.0.2, if the file has wrong file name (according to the forum), forum added a tag with the current date and time to file name. And that was enough to avoid errors.

We are using Joomla to verify the filenames and this might also be related to the latest security enchancements on Joomla. I've fixed the issue in upcoming Kunena 3.1 as it will allow different filenames on filesystem and what's shown to the user.

github.com/Kunena/Kunena-Forum/issues/1850

Oh, this is very great! Thank you!
What about this worning for users: "Avatar much weight and should weigh no more than xxx KB"?

I've also improved K3.0.4 to allow filenames where there are no latin-1/ascii characters.