This app was mentioned in 7 comments, with an average of 1.43 upvotes
The functionality is available here: www.svenska.se. SAOL is the dictionary to the very left. The app is available for Android here and iPhone here, but the website works just as well.
SAOL is also available as an app for free on Google Play & Itunes. It lists all inflections for any word including the correct indefinite article of a noun. Here's what it looks like if you search for <em>växtart</em>.
(1) First off: I'm not a fan of language apps. I tried them 4-5 years ago and they didn't convince me. I never gave them a shot ever since; but if there's a good one out there, maybe it's useful to you. Will you know it's good quality? - No. At first, a lot of things seem good quality when you only scratch the surface, but after a while (weeks/months/years) you realise that it wasn't that great after all (ex boy-/girlfriend, most Udemy courses, etc.). My experience with language apps is that the exercises were mediocre and didn't teach me much. I think they also didn't include any grammar rules/exercises or only very few and - if I recall correctly - you didn't learn the adjectives and plural forms of verbs either (I'm referring to learning Swedish).
I guess things might have changed at this point and it strongly depends on the app, but all in all, these apps didn't help me much back then. If they teach phrases like how to buy/order things, where to find the nearest toilet and where to eat surströmming, then they are probably useful to you and you can mostly ignore the grammar. But if you want to be more serious about learning Swedish, I don't know if they are really that good. They are probably nice to use in the beginning, but I wouldn't use them in the long run. It also seems guaranteed that some languages will be less supported and consequently have worse quality content. They are not going to earn a lot of money with Swedish content, are they? So why should they provide more sophisticated content that's specific to Swedish?
One thing you can also consider is buying books that teach Swedish (start with A1 and A2, obviously). I wouldn't use them on their own though, but in combination with a language app and other tools, they are surely helpful.
(2) There are numerous resources that help you with learning and looking up vocabulary/pronunciation. In Anki you can download custom made "decks" that teach you "stuff". I say stuff because it can be about any topic, not only languages. Download a deck called something like "3000 words English-Swedish" and start learning today. Just make sure these decks include articles and plural forms of verbs.
There are two helpful dictionary apps, but if I understand correctly, they are only in Swedish though. They are SAOL and Svensk ordbok. Even if you don't understand a single word of Swedish, they are still helpful. SAOL provides grammar of words and makes it easy to look up words. Svensk ordbok is fantastic in that it provides examples as to how words can be used in sentences, as well as a pronunciation of words (I'm pretty sure it's not automatically generated pronunciation, but an actual human saying the words). It also provides historical information, for example, for how long words have been used - very interesting. These apps are most helpful if you already know some Swedish, but an invaluable resource that helped me so much. By the way, both of them mostly work offline - the pronunciation feature requires internet connection though.
I also have a Swedish-English dictionary installed, but I can't find it on the Play Store anymore (it's called "Folkets ordbok"); maybe try Offline Swedish-English Dict instead. Basically, just use any dictionary app that suits your needs and make sure it includes explanations, grammar and examples of sentences.
One more thing I want to mention is Forvo. It's a place where any user can upload pronunciation of words and sentences. It only works when you enter Swedish words though, so make sure you look up the translation first. There are also links to Swedish phrases and more. I listened to a view phrases and one guy talks super quick. Not all Swedes talk like that! You can click on the words and phrases to see if more people pronounced it (they did).
Another tip I have is, of course, Google Translate. The tip being: don't only translate from Flemish to Swedish, but maybe from English to Swedish. I don't know how Google Translate works under the hood, but you can be sure that English to Swedish translations work quite well. Flemish to Swedish? I'm not so sure.
(3) Next up is actually somewhat answering your question, namely various resources about TV shows and co. I have to disappoint you a bit because I never really watched Swedish movies or shows as of now. But I still have some suggestions that could interest you (not sure how well it would work together with girlfriend though). For the one, there are many newspapers that you can try to read. In particular, there is one that has easy to read news, namely 8sidor. Just skip the Ukrainian news if they offend you. However, they are nice to learn Swedish, because you probably know about the stories already. So you can guess what words mean by having background information. "Partier vill stoppa rysk gas"... it's quite easy to tell what most words mean, right? Try to read such stuff and see how much you can understand (note: vill does not mean will).
Now, the next one is my absolute favourite and the main reason I'm still into Swedish after ~5 years. It's Sveriges Radio - I mainly use the mobile app. Now, you wonder what this is all about. The thing is that for example, channel "P1" only is about news, documentaries, talks, humor, phone calls, etc. and not about music. They don't play any music 99.9% of the times. This means you get to hear actual Swedish and conversations between Swedes. You can look for any podcast and listen to what you want. Some podcasts are rather sad and serious (especially the documentaries "P1 dokumentär"). Others are about the Swedish language (Språket) or humor (Lantzkampen, På Minuten). Humor is hard to understand though, even for me, since it's often related with politics and culture. Maybe the radio app is more for your girlfriend, I don't know. But the app is simply amazing because you can listen to so many things. Not only that, but they also save previous podcasts, which means you can listen to stuff that aired 15 years ago!
Other things I did is trying YouTube and Twitch (streaming platform of people playing games). In terms of YouTube, I didn't find many good channels (2-3 years ago). Consider checking out JLC, they are quite nice. I used to watch Jocke och Jonna many years ago but it's more for teenagers I'd say. I don't watch it anymore, but feel free to check them out. Quite frankly, I don't know that many YouTube channels with Swedish content. Many Swedes are good at English, so they often just post English content instead. In terms of Twitch, half the Swedes play GTA V for some reason - so maybe a bit boring to watch. A few channels that are quite okay to watch are ChrisWippit, SiQViQ and grannen_hero. I don't really use Twitch anymore but I guess they still stream. Simply use the "browse" functionality and filter for Swedish streams if you want to look for more streamers. Maybe you and your girlfriend would enjoy that.
Hope this helps and good luck.
Here some advice that is probably more suited to people who want to seriously learn Swedish, but it should help you nonetheless.
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SAOL och SO finns även som appar:
Android:
iOS:
Det finns även fler referensverk på wikin: